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: Surgery
[{'content': 'Half life of factor 8 is ? \nSelect and explain. \nA. 4 hours, B. 8 hours, C. 34 hours, D. 48 hours', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 8 hour", 'role': 'assistant'}]