HIV structure modified is related to:

Correct option is B

Ans (b) Sol. The HIV structure undergoes antigenic variation, which helps the virus evade immune detection. • (a) Mutation – Incorrect, though mutations happen, antigen variation is the primary mechanism. • (b) Antigen variation – Correct, HIV changes its surface proteins to avoid immune recognition. • (c) Drug resistance – Incorrect, although HIV can develop resistance, this isn't related to the structure. • (d) Genetic modification – Incorrect, genetic modification is a laboratory process, not a natural change in HIV.