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: Medicine
[{'content': 'Acute infection of hepatitis B virus is diagnosed by - \nSelect and explain. \nA. IgM antibody of Hbs Ag, B. IgM antibody of Hbc Ag, C. IgM antibody of Hbs Ag, D. IgG antibody of Hbc Ag', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]