Select the correct statements from the following : 

a- HIV enters into helper T-lymphocytes (T_H), replicates and produce progeny viruses.

b- A widely used diagnostic test for AIDS is enzyme linked immuno-sorbent assay (ELISA).

c- Treatment of AIDS with anti-retroviral drugs is only partially effective.

a,b and c

The correct answer is Option (4) – a, b, and c

Explanation:

• a) True – HIV primarily targets and enters helper T-lymphocytes (T_H) , replicates inside them, and produces progeny viruses, leading to the destruction of these immune cells.
• b) True – ELISA (Enzyme-Linked Immunosorbent Assay) is a widely used diagnostic test for detecting HIV infection (screening test). Confirmatory tests like Western are used afterward.
• c) True – Anti-retroviral therapy (ART) can control HIV replication but does not completely cure AIDS. It is only partially effective in managing the disease.