<prompt> Which of the following is a lentivirusHIVHBVHCVRabies virus  <response>: 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. 