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
Survival time of platelet is approximately: 
Select and explain. 
A. 10 hours, B. 10 days, C. 10 weeks, D. 100 days
B: 10 days
Answer: B: 10 days 
Explanation: None