Which of the following glands is often referred to in relation to $AIDS$?

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

The genetic material found in Human Immunodeficiency Virus $(HIV)$ is:

Arrange the following statements regarding $AIDS$ in the correct chronological order of the infection process:
$(1)$ After entering the individual's body,the $HIV$ virus enters macrophages,where the viral $RNA$ genome replicates into viral $DNA$ with the help of the reverse transcriptase enzyme.
$(2)$ $HIV$ enters helper $T$-lymphocytes.
$(3)$ $HIV$ has an $RNA$ molecule as its genetic material.
$(4)$ Newly formed viruses are released into the blood and attack other helper $T$-lymphocytes.
$(5)$ Viral $DNA$ is incorporated into the host cell's $DNA$.

Which of the following symptoms are characteristic of an $AIDS$ patient?

What is $ARC$ ($AIDS$-Related Complex)?