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': 'Acute Hepatitis can be earliest diagnosed by - \nSelect and explain. \nA. IgM anti HBc ab, B. Hbs Ag, C. IgG anti HBc abs, D. Anti HBs ab', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]