A nine-year-old boy with Hodgkin's lymphoma and a large right cervical and axillary lymph node falls into which staging classification:

Correct Answer: D

Rationale: Stage II-B indicates involvement of two or more lymph node regions on the same side of the diaphragm with systemic symptoms like fever or weight loss.

Correct Answer: C

Rationale: Around 3 months of age, an infant begins to recognize familiar faces and objects, including a feeding bottle.

Correct Answer: A

Rationale: Serious illness typically leads to tachycardia, increased respiratory effort, and use of accessory muscles, while blood pressure may drop in shock.

Correct Answer: B

Rationale: Rapid correction of hypernatremia can cause cerebral edema. The recommended safe correction rate is no more than 12 mmol/L per 24 hours.

Correct Answer: D

Rationale: For acute urticaria without a clear cause, no specific diagnostic testing is typically recommended initially.