O Levels Biology (5090)•5090/12/O/N/21

Explanation
Assessing HIV transmission and progression facts
Steps:
- Statement 1: Not all HIV-positive individuals develop AIDS, as antiretroviral therapy prevents progression in many cases.
- Statement 2: Unborn babies of HIV-positive mothers risk infection via vertical transmission during pregnancy or birth.
- Compare options: A correctly labels statement 1 false and statement 2 true.
- Eliminate mismatches: B, C, D incorrectly classify at least one statement.
Why A is correct:
- HIV is the virus causing AIDS, but modern treatments halt progression, so not all infected people develop the disease (per CDC guidelines).
Why the others are wrong:
- B: Wrongly marks first statement true, ignoring treatment effects.
- C: Wrongly marks second statement false, despite proven mother-to-child risks.
- D: Wrongly marks first statement true, overlooking preventable progression.
Final answer: A
Topic: Disease
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