The best initial treatment for transient tachypnea of the newborn (TTN) is:

Correct Answer: C

Rationale: TTN is caused by delayed clearance of fetal lung fluid, leading to mild respiratory distress. Oxygen therapy and CPAP help maintain oxygenation while the condition resolves within 24-72 hours without requiring aggressive intervention.

Correct Answer: C

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

Correct Answer: D

Rationale: Foods are not a common cause of ocular allergies, which are typically triggered by airborne allergens.

Correct Answer: C

Rationale: Massive pleural effusion causes decreased tactile vocal fremitus due to fluid accumulation, which dampens sound transmission. Other findings include tracheal deviation, dullness to percussion, and potential infectious complications.

Correct Answer: C

Rationale: Total anomalous pulmonary venous return can mimic RDS due to similar clinical and radiographic findings. The other conditions have distinct features.