Which of the following causes normal anion gap metabolic acidosis?

Correct Answer: B

Rationale: Renal tubular acidosis causes normal anion gap acidosis because it results from impaired renal acid excretion rather than accumulation of organic acids.

Correct Answer: C

Rationale: Measles has an incubation period of approximately 10-14 days before symptoms like fever, cough, and Koplik spots appear.

Correct Answer: D

Rationale: Skin prick tests and specific IgE tests can help identify relevant allergens.

Correct Answer: C

Rationale: For trauma patients, the jaw thrust (not chin lift) is the preferred airway maneuver to avoid cervical spine movement and further injury.

Correct Answer: D

Rationale: All listed options contribute to noncompliance. Misunderstanding, language barriers, unanswered questions, contrary advice, or reservations about the diagnosis can lead patients or caregivers to resist adherence.