Answer:
Competitive inhibitor.
Explanation:
AZT(Azidothymidine) acts a drug that works against the retro virus and can be used in the treatment of HIV. This drug is also used for the prevention of transmission of AIDS from mother to baby.
AZT drug binds to the active site of the substrate where the virus pathogen binds, compete with it and prevents its binding. AZT acts as the competitive inhibitor an inhibits the action of the virus.
Thus, the answer is competitive inhibitor.