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 of the following is a DNA virus \nSelect and explain. \nA. Hepatitis A virus, B. Hepatitis B virus, C. Hepatitis C virus, D. Hepatitis D virus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]