Question

HIV is a

• A. DNA virus
• B. RNA virus
• C. Paramyxo virus
• D. Retrovirus

Hint:

Retroviruses, like HIV, have RNA genomes that are reverse transcribed into DNA once inside host cells.

Answer 1

The Correct Option is D

HIV carries the enzyme reverse transcriptase, which it uses to convert its RNA genome into DNA before that DNA gets inserted into the host cell's own chromosome. This reverse flow of information, from RNA back to DNA, is the hallmark of the retrovirus family (Retroviridae), and HIV is the best-known human example. So while HIV is technically also an RNA virus, the precise and complete classification asked for here is retrovirus.

Answer 2

We can also answer this by thinking about the word "retro" itself and what it implies about the direction of genetic information flow.

1. DNA virus: Ruled out immediately - HIV's genetic material is single-stranded RNA, never DNA, inside the virus particle.
2. RNA virus: "Retro" means backward. In the normal cellular flow, DNA is transcribed into RNA. A retrovirus runs this process backward, transcribing its RNA into DNA, so HIV belongs to a very specific subgroup of RNA viruses, not just any RNA virus.
3. Paramyxo virus: Members of this family (mumps, measles, parainfluenza) copy RNA to RNA directly, with no DNA intermediate at all, so they sit outside this "reverse transcription" group entirely.
4. Retrovirus: HIV belongs to the genus Lentivirus within the family Retroviridae, precisely because of its reverse-transcription life cycle - this is the specific and correct classification.

Since the reverse-transcription step is what uniquely defines HIV's replication strategy, the family name that captures this is retrovirus.

Therefore, the correct answer is Retrovirus.