The MOST common childhood symptom of hereditary angioedema is

Correct Answer: C

Rationale: Hereditary angioedema presents as non-pitting, non-pruritic edema without urticaria, distinguishing it from allergic reactions.

Correct Answer: B

Rationale: A VSD murmur is holosystolic and shares characteristics with mitral regurgitation, typically best heard at the left lower sternal border.

Correct Answer: D

Rationale: Still's disease is characterized by fever, rash, and arthritis, making 'All of the above' the correct answer.

Correct Answer: D

Rationale: Irritability is an early sign of hypoxia in infants, as oxygen deprivation initially affects neurological function before progressing to more severe signs like cyanosis.

Correct Answer: C

Rationale: Minor criteria include arthralgia (joint pain without objective findings), fever, elevated acute phase reactants, and prolonged PR interval on ECG.