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

What does the $HIV$ virus in a retrovirus contain as its genetic material?

Which of the following is true regarding $HIV$,the agent responsible for $AIDS$?

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

What does '$A$' represent in the given figure?

Which of the following effects is observed in an individual infected with $HIV$?