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 represents the serologic evidence of recent Hepatitis B virus infection during "window" period? \nSelect and explain. \nA. HBs Ag, B. IgM anti — HBc, C. Anti HBs, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]