Correct Answer: B

Rationale: Substance abusers are at high risk and part of the vulnerable population.

Correct Answer: D

Rationale: Smallpox rash is most prominent on the face and extremities and is distinctive from chickenpox.

Correct Answer: A

Rationale: A BMI at the 80th percentile is within the normal weight range for children.

Correct Answer: C

Rationale: Cultural practices and misunderstanding of HIV transmission contribute to its spread.

Correct Answer: C

Rationale: A behavior change, such as regularly taking medications, is a sign that health education objectives are being met.