Which of the following is an example of a virus?

Correct option is A

The correct answer is (A) HIV.

HIV (Human Immunodeficiency Virus) is a virus that attacks the immune system, specifically the CD4 cells (T cells), and can lead to AIDS if left untreated.
HIV is a virus that attacks the body's natural defense system, the immune system.
Without a strong immune system, the body has trouble fighting disease.
Both the virus and the infection it causes are called HIV.
White blood cells are an important part of the immune system.

Information Booster:
Anthrax is caused by a bacterium called Bacillus anthracis.
AIDS (Acquired Immunodeficiency Syndrome) is a disease caused by HIV, but it is not a virus itself.
Elephantiasis is caused by parasitic worms, specifically Wuchereria bancrofti, not a virus.