This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Which of the following is a lentivirus 
Select and explain. 
A. HIV, B. HBV, C. HCV, D. Rabies virus
A: HIV
Answer: A: HIV 
Explanation: Ans. is 'a' i.e., HIV The etiologic agent of AIDS is HIV, which belongs to the family of human retroviruses (Retroviridae) and the subfamily of lentiviruses.HIV is also known as Human T cell lymphotrophic virus HI (HTLV-III) or Lymphadenopathy associated virus (LAV).