Recurrent coughing and wheezing occurs in 35% of preschool-age children. Those who continue to have persistent asthma into later childhood are approximately

Correct Answer: C

Rationale: About one-third of preschool children with recurrent wheezing develop persistent asthma, especially those with risk factors like atopy and family history.

Correct Answer: D

Rationale: Innocent murmurs are typically ejection systolic, occurring during ventricular contraction and are usually benign.

Correct Answer: C

Rationale: Prophylactic penicillin is not typically used in minor burns unless there is a specific infection risk, as it can promote antibiotic resistance.

Correct Answer: B

Rationale: Vaccination does not amplify anaphylaxis, while infections, stress, and physical activity can increase susceptibility.

Correct Answer: D

Rationale: In the uncompensated stage of shock, microvascular perfusion becomes marginal, leading to tissue hypoxia and metabolic acidosis.