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: Physiology
[{'content': 'Survival time of platelet is approximately: \nSelect and explain. \nA. 10 hours, B. 10 days, C. 10 weeks, D. 100 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]