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': 'HCV is: \nSelect and explain. \nA. Enveloped RNA virus, B. Unenveloped RNA virus, C. Unenveloped positive strand RNA, D. Unenveloped negative strand RNA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Enveloped RNA virus', 'role': 'assistant'}]