This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Medicine
[{'content': 'What is the incubation period of hepatitis B? \nSelect and explain. \nA. 1 - 30 days, B. 15 - 45 days, C. 45 - 180 days, D. 2 weeks - 6 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 30-180 incubation period according to text books Hepatitis B Dane paicle Earliest evidence of infection HbsAg+ (Surface antigen) First antibody to Appear IgM anti HBcAg+ HBsAg + IgM anti HBcAg + Acute Hep B', 'role': 'assistant'}]