A term infant presents with tachypnea, grunting, and nasal flaring shortly after birth. A chest X-ray shows fluid in the lung fissures. What is the most likely diagnosis?

Correct Answer: C

Rationale: Transient tachypnea of the newborn (TTN) is caused by delayed clearance of fetal lung fluid, common in infants born via cesarean section. Symptoms resolve within 24-72 hours with supportive care.

Correct Answer: A

Rationale: Serum sickness is a type III hypersensitivity reaction where immune complexes deposit in tissues, causing inflammation.

Correct Answer: D

Rationale: These results indicate metabolic alkalosis with an elevated bicarbonate and normal CO2, showing no respiratory compensation.

Correct Answer: C

Rationale: Immunotherapy is not effective for anaphylaxis to a wasp sting, as it is an acute, life-threatening reaction requiring immediate epinephrine.

Correct Answer: E

Rationale: Local lymph node involvement in RCC has an adverse outcome.