Regarding multiple gestation pregnancies, the following are true EXCEPT

Correct Answer: D

Rationale: The overall incidence of multifetal gestation has increased due to assisted reproductive technologies. The other statements are true regarding multiple gestation pregnancies.

Correct Answer: A

Rationale: Rumination is not seen exclusively in infants and those with intellectual disability; it can occur in other populations as well.

Correct Answer: D

Rationale: Innocent murmurs are benign and require no restriction of activity, antibiotic prophylaxis, or serial echocardiography unless symptoms suggest structural heart disease.

Correct Answer: B

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

Correct Answer: C

Rationale: The anion gap is calculated as (Na⁺ - [Cl⁻ + HCO₃⁻]) and represents unmeasured anions in plasma. It helps differentiate metabolic acidosis causes, with high values suggesting lactic acidosis or toxin ingestion.