It is estimated that lead-poisoned children are identified by screening procedures rather than through clinical recognition of lead-related symptoms in

Correct Answer: A

Rationale: Lead poisoning is often asymptomatic and detected through screening rather than clinical symptoms.

Correct Answer: D

Rationale: Pediatrician concern alone is not sufficient to raise suspicion without corroborating evidence from caregivers or parents.

Correct Answer: C

Rationale: Renal tubular acidosis is associated with normal anion gap metabolic acidosis, unlike conditions like diabetic ketoacidosis and renal failure.

Correct Answer: A

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

Correct Answer: C

Rationale: Persistence of the umbilical cord beyond 30 days may indicate an underlying abnormality, such as infection or impaired healing.