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At which stage of HIV infection does one usually show symptoms of AIDS:
A
Within 15 days of sexual contact with an infected person
B
When the infected retro virus enters host cells
C
When HIV damages large number of helper T-Lymphocytes
D
When the viral DNA is produced by reverse transcriptase
Detailed Solution
AIDS symptoms appear when HIV has destroyed a large number of helper T-lymphocytes, making the person immuno-deficient. This can take several years after infection.