$HIV$ decreases natural immunity of the body by
Destroying antibodies
Destroying erythrocytes
Attacking $T$-lymphocytes
Attacking $B$-lymphocytes
Eradication of smallpox has been possible due to the following facts except
$A$ : $LSD$ and marijuana are clinically used as analgesics.
$R$ : Both these drugs suppress brain function.
‘Itaria-itaria' disease is caused by
Assertion: Epstein-Barr virus is an oncovirus.
Reason: It stimulates the growth of cancer.