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HIV infection does usually show symptoms of AIDS. When HIV damages large number of helper T-Lymphocytes (CD4 cells), AIDS is the stage of HIV infection that occurs when one immune system is badly damaged and one becomes vulnerable to infections and cancers. When the number of CD4 cells falls below 200 cells per cubic millimetre of blood (200 cells/mm3), one is considered to have progressed to AIDS.

1. HIV infection does usually show symptoms of AIDS.
2. When HIV damages large number of helper T-Lymphocytes (CD4 cells), AIDS occurs.
3. AIDS is the stage of HIV infection that occurs when the immune system is badly damaged.
4. None of the above.

Correct answer: AIDS is the stage of HIV infection that occurs when the immune system is badly damaged.

Solution

AIDS is not simply the presence of HIV symptoms; it is the advanced stage of HIV infection when the immune system is badly damaged, often after CD4 counts fall very low. That matches option C exactly.

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