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. When the infecting retrovirus enters host cells
2. When viral DNA is produced by reverse trancriptase
3. When HIV replicates rapidly in helper T-lymphocytes and damages large number of these
4. Within 15 day of sexual contact with an infected person.

Correct Option: C

When HIV replicates rapidly in helper T-lymphocytes and damages large number of these cells, at this stage infected persons start showing symptoms of AIDS.