Which tests are used for the diagnosis of $AIDS$?

Assertion $A$: $AIDS$ is a severe,incurable,infectious,and fatal disease.
Reason $R$: $HIV$ causes deficiency of the immune system in the body.
Which option is correct for Assertion $A$ and Reason $R$?

$AIDS$ is a

The $HIV$ virus converts its $RNA$ into the host's $DNA$ at which location and by which enzyme?

The technique used to detect $HIV$ in a suspected $AIDS$ patient during the asymptomatic stage is

Which one of the following produces $AIDS$?