Child and Adolescent Psychiatry Practice Questions

Q: Which is the most common genetic cause of mental retardation?

Fragile X syndrome. **Explanation:** The correct answer is **Fragile X syndrome**. In medical genetics and psychiatry, it is crucial to distinguish between the most common *genetic* cause and the most common *chromosomal* cause of intellectual disability (ID). 1. **Fragile X Syndrome (Correct):** It is the **most common inherited (genetic) cause** of mental retardation. It is caused by an expansion of the CGG trinucleotide repeat in the *FMR1* gene on the X chromosome. Clinically, it presents with a long face, large prominent ears, and macro-orchidism (post-pubertal). 2. **Tuberous Sclerosis:** This is a neurocutaneous syndrome (phakomatosis) characterized by seizures, facial angiofibromas, and "ash-leaf" spots. While it is associated with ID, it is significantly less common than Fragile X. 3. **Cri-du-chat Syndrome:** Caused by a deletion of the short arm of chromosome 5 (5p-). It presents with a characteristic cat-like cry and severe ID, but it is a rare chromosomal deletion. 4. **Angelman Syndrome:** Caused by the loss of the maternal copy of chromosome 15q11-q13 (genomic imprinting). Known as "Happy Puppet" syndrome, it features frequent laughter and ataxia, but is not the most common cause. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of ID (Overall):** Down Syndrome (Trisomy 21). Note: Down Syndrome is the most common *chromosomal* cause, but most cases are sporadic (nondisjunction), not inherited. * **Most common inherited/genetic cause of ID:** Fragile X Syndrome. * **Most common preventable cause of ID:** Fetal Alcohol Syndrome. * **Fragile X Genetics:** Shows "Anticipation" (severity increases in successive generations) and is diagnosed via PCR or Southern Blot.

Q: Which of the following conditions is seen exclusively in females?

Rett syndrome. **Explanation:** **Rett Syndrome (Correct Answer):** Rett syndrome is a neurodevelopmental disorder caused by a mutation in the **MECP2 gene** located on the **X chromosome**. It is seen almost exclusively in females because the mutation is typically **lethal in hemizygous males** (who possess only one X chromosome), leading to miscarriage or early neonatal death. Affected girls appear to develop normally for the first 6–18 months, followed by a characteristic regression of language and motor skills, the development of **stereotypical hand-wringing movements**, and microcephaly. **Incorrect Options:** * **Asperger’s Syndrome & Autism:** Both are part of the Autism Spectrum Disorders (ASD). These conditions are significantly **more common in males** (ratio approx. 4:1). While they occur in females, they are by no means exclusive to them. * **Early Onset Schizophrenia:** This refers to schizophrenia diagnosed before age 13. It is rare and actually shows a **male preponderance** in childhood, with a more severe clinical course often seen in boys. **High-Yield Clinical Pearls for NEET-PG:** * **The "Hand-Wringing" Sign:** This is the classic board-exam descriptor for Rett Syndrome (loss of purposeful hand use replaced by repetitive wringing/clapping). * **MECP2 Gene:** Always associate this gene with Rett Syndrome. * **Stages of Rett:** Remember the "Regression" phase—a child who was meeting milestones but suddenly stops and loses acquired skills. * **ICD-11/DSM-5 Update:** Asperger’s is no longer a standalone diagnosis; it is now subsumed under **Autism Spectrum Disorder (ASD)**.

Q: Encopresis is associated with which of the following?

Severe emotional disturbances. **Explanation:** **Encopresis** is defined as the repeated passage of feces into inappropriate places (involuntary or intentional) in a child at least **4 years of age**, occurring at least once a month for at least 3 months, and not due to a substance or medical condition. **Why the Correct Answer is Right:** **Severe emotional disturbances** are frequently associated with non-retentive encopresis. While the most common cause of encopresis is chronic constipation (overflow incontinence), cases without constipation are often linked to psychological stressors, such as a chaotic home environment, physical or sexual abuse, or oppositional defiant disorder. In these instances, the act may be a manifestation of emotional distress or a "cry for help." **Why Incorrect Options are Wrong:** * **A. Low socioeconomic class:** Unlike Enuresis (bedwetting), which shows a higher prevalence in lower socioeconomic groups, Encopresis does not have a strong or consistent correlation with socioeconomic status. * **B. Child less than 4 years old:** By definition (DSM-5/ICD-11), a child must have a chronological or developmental age of at least **4 years** to be diagnosed with encopresis, as bowel control is typically expected by this age. * **C. Female sex:** Encopresis is significantly more common in **males** (estimated ratio of 3:1 to 4:1). **High-Yield Clinical Pearls for NEET-PG:** * **Primary Encopresis:** The child has never achieved fecal continence. * **Secondary Encopresis:** Fecal incontinence develops after a period of at least one year of continence. * **Most Common Cause:** Functional constipation (Retentive Encopresis) accounts for ~80% of cases. * **Management:** Initial steps involve "disimpaction" followed by maintenance with stool softeners and behavioral toilet training. Psychological intervention is indicated if emotional disturbances are present.

Q: Who proposed the theory of psychosexual development?

Freud. **Explanation:** The theory of **Psychosexual Development** was proposed by **Sigmund Freud**, the father of psychoanalysis. Freud posited that personality develops through a series of childhood stages in which the pleasure-seeking energies of the *Id* (libido) become focused on specific erogenous zones. According to Freud, successful completion of these stages (Oral, Anal, Phallic, Latency, and Genital) results in a healthy personality, while failure to resolve conflicts at a specific stage leads to **fixation**. **Analysis of Incorrect Options:** * **B. Piaget:** Jean Piaget is renowned for the **Theory of Cognitive Development**, which describes how children construct a mental model of the world through four stages (Sensorimotor, Preoperational, Concrete Operational, and Formal Operational). * **C. Skinner:** B.F. Skinner was a leading behaviorist who proposed the theory of **Operant Conditioning**, focusing on how reinforcement and punishment influence behavior. * **D. Kaplan:** Harold Kaplan (along with Benjamin Sadock) is famous for authoring the definitive textbook of psychiatry (*Kaplan & Sadock's Comprehensive Textbook of Psychiatry*), but he did not propose the psychosexual stages. **High-Yield Clinical Pearls for NEET-PG:** * **Freud’s Stages:** Oral (0-1 yr), Anal (1-3 yrs), Phallic (3-6 yrs), Latency (6-puberty), Genital (puberty onwards). * **Phallic Stage:** This is the most high-yield stage for exams, involving the **Oedipus complex** (boys) and **Electra complex** (girls). * **Defense Mechanisms:** Freud’s daughter, Anna Freud, further expanded on defense mechanisms, which are frequently tested (e.g., Projection, Reaction Formation, Sublimation). * **Erik Erikson:** Often confused with Freud, Erikson proposed **Psychosocial Development** (8 stages), focusing on social interaction rather than sexual energy.

Q: Which of the following is FALSE regarding Rett's syndrome?

Microcephaly at birth. **Explanation:** Rett’s syndrome is a neurodevelopmental disorder primarily affecting females. The correct answer is **A** because, in Rett’s syndrome, head circumference is typically **normal at birth**. The characteristic feature is **deceleration of head growth** (leading to acquired microcephaly) occurring between 5 months and 4 years of age, rather than being present congenitally. **Analysis of Options:** * **Option B (X-linked inheritance):** This is true. It is caused by a mutation in the **MECP2 gene** on the X chromosome. It is usually lethal in hemizygous males, which is why it is seen almost exclusively in females. * **Option C (Poor social interaction):** This is true. During the "regression phase," children lose previously acquired social and language skills, often mimicking symptoms of Autism Spectrum Disorder. * **Option D (Stereotypical hand movements):** This is a hallmark diagnostic feature. Patients lose purposeful hand skills and develop repetitive, "hand-washing" or "hand-wringing" midline stereotypes. **High-Yield Clinical Pearls for NEET-PG:** 1. **The "Regression" Key:** Look for a girl who had normal development for the first 6–18 months, followed by a loss of milestones. 2. **Seizures & Ataxia:** Up to 80% of patients develop seizures; a wide-based, ataxic gait is also common. 3. **Breathing Abnormalities:** Episodes of hyperventilation and apnea while awake are characteristic. 4. **ICD-10/DSM-5:** Previously classified under Pervasive Developmental Disorders (PDD), it is now recognized as a distinct genetic neurological condition.

Q: Which of the following is the fastest growing developmental disorder?

Autism spectrum disorder. **Explanation:** **Autism Spectrum Disorder (ASD)** is currently recognized as the fastest-growing developmental disorder worldwide. This rapid increase in prevalence is attributed to several factors: expanded diagnostic criteria in the DSM-5 (which merged previously separate conditions like Asperger’s into a single spectrum), increased clinical awareness among pediatricians and educators, and improved screening tools leading to earlier detection. Current CDC data suggests a prevalence of approximately 1 in 36 children, a significant rise from previous decades. **Analysis of Incorrect Options:** * **Specific Learning Disorder (SLD):** While common (affecting 5-15% of school-aged children), the diagnostic rates have remained relatively stable compared to the exponential rise seen in ASD. * **Intellectual Developmental Disorder (IDD):** Formerly known as Mental Retardation, the prevalence of IDD is generally stable (around 1%) and is often linked to fixed genetic or prenatal insults rather than the shifting diagnostic trends seen in ASD. * **Childhood-Onset Fluency Disorder (Stuttering):** This is a communication disorder. While common in early childhood, most cases resolve spontaneously or with therapy, and it does not show a rising epidemiological trend. **High-Yield Clinical Pearls for NEET-PG:** * **M-CHAT (Modified Checklist for Autism in Toddlers):** The most commonly used screening tool for ASD (usually performed at 18 and 24 months). * **Core Deficits:** 1) Persistent deficits in social communication/interaction and 2) Restricted, repetitive patterns of behavior/interests. * **Early Sign:** Lack of joint attention (e.g., not pointing to show objects of interest) and failure to respond to name by 12 months. * **Prognosis:** The best predictors of long-term outcome are the **level of intelligence (IQ)** and **communicative language development** by age 5.

Q: A 13-year-old boy frequently argues with parents and teachers. He is not physically aggressive, and there is no history of drug abuse, theft, lying, or bullying. What is the most likely diagnosis?

Oppositional defiant disorder. ### Explanation **1. Why Oppositional Defiant Disorder (ODD) is correct:** The core feature of ODD is a persistent pattern of **angry/irritable mood, argumentative/defiant behavior, or vindictiveness** lasting at least 6 months. This patient fits the classic profile: a teenager who frequently argues with authority figures (parents/teachers) but **lacks** the severe violations of societal norms or the rights of others. Crucially, ODD does not involve physical aggression, theft, or deceit. **2. Why the other options are incorrect:** * **Conduct Disorder (CD):** This is the "next step" in severity. CD requires a repetitive pattern of violating the basic rights of others or major age-appropriate societal norms. Key features absent here include **aggression to people/animals, destruction of property, deceitfulness/theft, and serious rule violations** (e.g., truancy, running away). * **Autism & Pervasive Developmental Disorder (PDD):** These are neurodevelopmental disorders characterized by deficits in social communication, social interaction, and restricted, repetitive patterns of behavior or interests. The clinical vignette describes a behavioral conflict with authority, not a deficit in social-emotional reciprocity or sensory issues. **3. High-Yield Clinical Pearls for NEET-PG:** * **ODD vs. CD:** Think of ODD as "verbal/defiant" and CD as "physical/criminal." * **Progression:** Approximately 30-50% of children with ODD may eventually develop Conduct Disorder. * **Comorbidity:** ADHD is the most common comorbid condition associated with ODD. * **Age Factor:** If the patient is over 18 and met criteria for CD before age 15, the diagnosis shifts to **Antisocial Personality Disorder**. * **Treatment:** The first-line management for ODD is **Parent Management Training (PMT)** and behavioral therapy, rather than pharmacotherapy.

Q: A 12-year-old child with academic difficulties is administered an intelligence test, which reveals they function mentally at the level of an 8-year-old. What category of intellectual function best describes this child?

Mildly intellectually disabled. ### Explanation **1. Understanding the Calculation (The IQ Formula)** To determine the category of intellectual function, we must first calculate the Intelligence Quotient (IQ) using the classic formula: **IQ = (Mental Age / Chronological Age) × 100** In this case: * Mental Age (MA) = 8 years * Chronological Age (CA) = 12 years * **IQ = (8 / 12) × 100 = 66.66 (approx. 67)** **2. Classification of Intellectual Disability (ID)** According to the ICD and DSM-5 criteria, an IQ of **67** falls into the **Mild Intellectual Disability** range (IQ 50–70). These individuals are often "educable," reaching up to a 6th-grade academic level by late adolescence and can live independently with minimal support. **3. Analysis of Incorrect Options** * **A. Severely intellectually disabled:** IQ range is **20–34**. These individuals require significant supervision and have very limited communication skills. * **B. Moderately intellectually disabled:** IQ range is **35–49**. They are considered "trainable," reaching a 2nd-grade academic level, and require supervised living (group homes). * **D. Borderline intellectual functioning:** IQ range is **71–84**. This is not classified as an intellectual disability but represents a deficit in cognitive capacity below the average range (90–110). **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** Mild ID is the most common, accounting for ~85% of all cases. * **Most Common Genetic Cause:** Down Syndrome (Trisomy 21). * **Most Common Inherited Cause:** Fragile X Syndrome. * **Most Common Preventable Cause:** Fetal Alcohol Syndrome. * **Diagnosis:** Requires deficits in both **intellectual functioning** (IQ < 70) and **adaptive functioning** (ADLs) with onset during the developmental period.

Question 1

Which is the most common genetic cause of mental retardation?

Accepted Answer

Fragile X syndrome

Answer

Tuberous sclerosis

Answer

Cri-du-chat syndrome

Answer

Angelman syndrome

Question 2

Mild MR features are:

Accepted Answer

Incidence in low socioeconomic groups

Answer

Present in 5-10% of the population

Answer

Presents by 2 years of age

Answer

Genetic background is present

Question 3

Which of the following conditions is seen exclusively in females?

Accepted Answer

Rett syndrome

Answer

Asperger's syndrome

Answer

Early onset schizophrenia

Answer

Autism

Question 4

Encopresis is associated with which of the following?

Accepted Answer

Severe emotional disturbances

Answer

Low socioeconomic class

Answer

Child less than 4 years old

Answer

Female sex

Question 5

Who proposed the theory of psychosexual development?

Accepted Answer

Freud

Answer

Piaget

Answer

Skinner

Answer

Kaplan

Question 6

By which method can activities of daily living be taught to a mentally retarded child?

Accepted Answer

Contingency management

Answer

Self instruction

Answer

Cognitive therapy

Answer

Cognitive remediation

Question 7

Which of the following is FALSE regarding Rett's syndrome?

Accepted Answer

Microcephaly at birth

Answer

X-linked inheritance

Answer

Poor social interaction

Answer

Stereotypical hand movements

Question 8

Which of the following is the fastest growing developmental disorder?

Accepted Answer

Autism spectrum disorder

Answer

Specific learning disorder

Answer

Intellectual developmental disorder

Answer

Childhood onset fluency disorder

Question 9

A 13-year-old boy frequently argues with parents and teachers. He is not physically aggressive, and there is no history of drug abuse, theft, lying, or bullying. What is the most likely diagnosis?

Accepted Answer

Oppositional defiant disorder

Answer

Conduct disorder

Answer

Autism

Answer

Pervasive developmental disorder

Question 10

A 12-year-old child with academic difficulties is administered an intelligence test, which reveals they function mentally at the level of an 8-year-old. What category of intellectual function best describes this child?

Accepted Answer

Mildly intellectually disabled

Answer

Severely intellectually disabled

Answer

Moderately intellectually disabled

Answer

Borderline intellectual functioning

Child and Adolescent Psychiatry — MCQs

Child and Adolescent Psychiatry — MCQs

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