This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'Incubation period of Hepatitis B virus \nSelect and explain. \nA. 8-10 days, B. 30-180 days, C. 1 year, D. 2 years', 'role': 'user'}, {'content': "Answer: B \nExplanation: Incubation Period of Hepatitis B virus is 30-180 days Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 234", 'role': 'assistant'}]