Obsessive-compulsive disorder (OCD) may be inherited. Other factors such as infection may account for small percentage of childhood-onset OCD. Which of the following infections may account for childhood-onset OCD?

Correct Answer: C

Rationale: Group A beta-hemolytic streptococcal infections are linked to pediatric autoimmune neuropsychiatric disorders (PANDAS), which can trigger OCD.

Correct Answer: A

Rationale: Allergic conjunctivitis is the most frequent hypersensitivity response in the eye, triggered by environmental allergens and mediated by IgE.

Correct Answer: C

Rationale: Antenatal exposure to magnesium sulfate is not associated with poor academic performance; it is used to protect against cerebral palsy. The other factors are known to impact neurodevelopment.

Correct Answer: C

Rationale: Early onset is typically associated with a worse prognosis.

Correct Answer: C

Rationale: Encopresis is the repeated, involuntary passage of stool in inappropriate places, often due to chronic constipation or psychological issues in children.