HIV/AIDS is an example of a virus.

• A. It is a toxin
• B. It is a virus
• C. It is a fungus
• D. It is a bacteria

Answer: (B)

HIV/AIDS is classified as a virus because HIV is a viral pathogen that relies on human cells to replicate. Viruses are tiny infectious agents with genetic material (RNA, in this case) inside a protein coat; they lack the full cellular machinery that living cells have and cannot reproduce on their own. HIV specifically targets immune cells, using the host cell’s machinery to multiply, which leads to the immune system’s gradual failure and the development of AIDS.

This is different from a toxin, which is a harmful substance produced by living organisms but is not itself a living infectious agent. It’s also different from fungi, which are complex living organisms with their own cells, and from bacteria, which are single-celled microorganisms with their own cellular structure. HIV has no cells of its own, so it isn’t any of those categories. AIDS describes the disease outcome caused by HIV infection, not the agent itself.