The predominant cause of low-birthweight births in America is

Correct Answer: B

Rationale: Prematurity is the leading cause of low birthweight in the United States

Correct Answer: C

Rationale: For pulseless ventricular tachycardia, initial defibrillation with 4J/kg is recommended for effective resuscitation.

Correct Answer: B

Rationale: The correct answer is B. The best age to introduce solid foods into an infant's diet is typically between 4 to 6 months. At this age, the infant's digestive system has matured enough to handle more complex nutrients, and they have likely lost the extrusion reflex, making swallowing easier. It is an important transition period for introducing new foods.

Correct Answer: A

Rationale: Isoniazid is a known cause of drug-induced systemic lupus erythematosus.

Correct Answer: D

Rationale: Woods lamp is primarily used for detecting skin conditions and fungal infections, not relevant for diagnosing ASD. Other tests like hearing assessments and brain imaging help rule out alternative causes.