$A$ - $HIV$ has an envelope enclosing the $RNA$ genome.
$R$ - $AIDS$ is caused by $HIV$.

The replication of a retrovirus is shown below. Which enzyme is responsible for the process labeled $P$?

The $ELISA$ test is used for the diagnosis of

How many of the following factors are responsible for the spread of $AIDS$?
$I -$ Sexual contact with an infected person
$II -$ Wearing clothes of an infected person
$III -$ Transmission from infected mother to the foetus through the placenta
$IV -$ Shaking hands with an infected person
$V -$ Use of contaminated blood and blood products
$VI -$ Use of contaminated needles or syringes by drug addicts

Into how many categories can individuals infected with $HIV$ be classified?

$AIDS$ is caused by: