Can someone explain this?

Answer is (A). In the case of HIV infection the virus targets the Th that is T- Helper cells which are helpful in activating Tc of Cytotoxic T cells & B- cells specific for killin...

HIV always related to the Th { having CD 4 Receptor and recognise MHC 2 } and Tc { having CD 8 Receptor and recognise MHC 1 }. in HIV virus infection always Tc cells are dicreas ...