All are true regarding croup except:

Correct Answer: C

Rationale: Croup is more common in males, affecting young children with a characteristic barking cough and stridor. Parainfluenza virus is the leading cause, with peak incidence around 6 months to 3 years.

Correct Answer: D

Rationale: Thelarche typically occurs between ages 8-13, marking the start of female puberty.

Correct Answer: B

Rationale: Ultrasound is the preferred imaging technique for screening IVH in premature infants, not MRI. The other statements are true regarding IVH.

Correct Answer: B

Rationale: Mosquitoes are not a common cause of insect sting anaphylaxis, unlike honeybees, yellow jackets, wasps, and fire ants.

Correct Answer: B

Rationale: The steeple sign, seen on X-ray, is a hallmark of viral croup, indicating subglottic airway narrowing.