HIV causes reduction in

  • A

    $T-$ helper cells only

  • B

    All $T-$cells

  • C

    $B-$ cells only

  • D

    Both $B$ and $T-$ cells

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$A$ : Vaccine against $AIDS$ has not been made inspite of repeated attempts.
$R$ : $HIV$ has the ability to get mutated to form several subtypes.