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: B

Rationale: Ignoring the behavior allows the child to outgrow it naturally without drawing unnecessary attention. Reassurance and encouragement are also helpful but ignoring avoids reinforcing the habit.

Correct Answer: D

Rationale: Tricuspid atresia leads to severe cyanosis due to lack of right atrioventricular connection, necessitating a right-to-left shunt for survival. It presents early with cyanosis and hypoxia requiring urgent intervention.

Correct Answer: D

Rationale: Heart failure is not a common feature of TOF due to the obstructed right ventricular outflow, which limits pulmonary overcirculation.

Correct Answer: D

Rationale: Harlequin color change is a normal physiological phenomenon observed in newborns