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
[{'content': 'All the following are true about HIV except - \nSelect and explain. \nA. A DNA virus belonging to lentivirus, B. Attacks CD4 lymphocytes, C. CD4: CD8 ratio is reversed, D. Mostly spread by heterosexual contact', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., A DNA virus belonging to lentivirus . HIV is a RNA virus, belongs to family retroviridae and subfamily of lentivirus.", 'role': 'assistant'}]