$AIDS$ is characterized by a sharp reduction in:

$HIV$ attacks which of the following cells?

Which of the following viruses contains the enzyme reverse transcriptase?

At which stage of $HIV$ infection does one usually show symptoms of $AIDS$?

Which of the following cells are infected in a person suffering from $AIDS$?

How many of the following statements regarding the transmission of $AIDS$ are correct?
$(a)$ $AIDS$ is transmitted by using the belongings of an infected person.
$(b)$ It can be transmitted through organ transplantation.
$(c)$ It can be transmitted through blood donation.
$(d)$ It can be transmitted from mother to child through the placenta.
$(e)$ It spreads through droplet infection via sneezing and coughing.
$(f)$ It is transmitted from a breastfeeding mother to her child.
$(g)$ It can be transmitted through the saliva of a patient.