Which one of the following produces $AIDS$?

Which diagnostic test would you suggest for a patient suffering from Acquired Immunodeficiency Syndrome $(AIDS)$?

Give the full form of $\rm {ELISA}$. Which disease can be detected using it? Discuss the principle underlying the test.

Consider the following statements about $AIDS$.
$I.$ $AIDS$ patient become easily infected by bacteria,viruses and even parasites.
$II.$ The person is unable to protect himself against any infection.
$III.$ National $AIDS$ Control Organisation $(NACO)$ and non-governmental organizations are trying their best to educate people about $AIDS$.
Which of the statements given above are correct?

In the given flow diagram,the replication of a retrovirus in a host is shown. Observe and answer the following questions.
$(a)$ Fill in $(A)$ and $(B)$.
$(b)$ Why is the virus called a retrovirus?
$(c)$ Can the infected cell survive while viruses are being replicated and released?

Which method is used for the diagnosis of $AIDS$?