$AIDS$ is caused by which of the following?

In which country was $AIDS$ first reported?

Identify the correct sequence for the mechanism of $HIV$ infection:
$1.$ Viral $RNA$ replicates to form viral $DNA$ with the help of reverse transcriptase.
$2.$ The progeny viruses released in the blood attack other $T_H$ cells and destroy them.
$3.$ Viral $DNA$ gets incorporated into the host cell's $DNA$ and produces virus particles.
$4.$ Virus enters into macrophages.

The presence of the $HIV$ virus was first reported in:

Which of the following statements is $NOT$ correct for $AIDS$?

Hepatitis-$B$ and $HIV$ spread through: