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': 'Which HIV-virus is more dangerous: \nSelect and explain. \nA. HIV-1, B. HIV-2, C. Both are same, D. It depends on host factors', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. HIV-1', 'role': 'assistant'}]