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': 'Hepatitis virus without envelope: \nSelect and explain. \nA. HAV, B. HBV, C. HCV, D. HDV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) HAV Ref. Harrison 19/e, p 2006, 18/e, p 2539 HAV is a nonenveloped ss RNA virus of picorna family For details see answer no 12 of chapter 27.', 'role': 'assistant'}]