At which stage of HIV infection does one usually show symptoms

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At which stage of HIV infection does one usually show symptoms of AIDS:-

1. Within 15 days of sexual contact with an infected person.
2. When the infected retro virus enters host cells.
3. When HIV damages large number of helper T-Lymphocytes.
4. When the viral DNA is produced by reverse transcriptase.

Correct Option: C

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 become vulnerable to infections and infection-related cancers called opportunistic infections. When the number of ones CD4 cells falls below 200 cells per cubic millimetre of blood (200 cells/mm3), one is considered to have progressed to AIDS.