The genome of $HIV$ replicates in the macrophages with the help of an enzyme called:

Assertion $A$: For an $AIDS$ patient,it becomes impossible to protect against infections from various diseases.
Reason $R$: $HIV$ infection leads to a decrease in the number of helper $T$-lymphocytes in the body.
Which option is correct for Assertion $A$ and Reason $R$?

Provide the full forms of the following:
$1.$ $\text{HIV}$
$2.$ $\text{ELISA}$
$3.$ $\text{NACO}$

Give scientific reasons: An $AIDS$ patient should not be isolated from the family or society.

An additional risk of drug addiction,especially of $heroin$,is

Assertion: $HIV$ infected persons are prone to opportunistic diseases.
Reason: Immune system weakens during $HIV$ infection.