The human immunodeficiency virus (HIV) infects and kills cells of the immune system. A person infected with HIV can be treated with the antiviral medication AZT. This medication slows the progression of HIV by preventing the virus from integrating into the individual's genome. What is the best explanation of why AZT slows the progression of HIV?

Explanation:

AZT known as Zidovudine is an antiretroviral drug, and used in the treatment of human immunodeficiency virus (HIV) infection called AIDS. As it is a  nucleoside reverse transcriptase inhibitor, it slows the progress of HIV infection by inhibiting replication of HIV by RT, and it's main target is reverse transcriptase enzyme.  

HIV destroys cells, called CD4 T cells (T helper cells). These cells are very important cells of our immune system.

AZT slows down the progress of HIV infection by decreasing virus load in the body.

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