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
Life span of neutrophils is: 
Select and explain. 
A. 6 hours, B. 6 days, C. 10 days, D. 15 days
A: 6 hours
Answer: A: 6 hours 
Explanation: A i.e. 6 HoursThe average half life of neutrophils in the circulation is 6 Hours.QTo maintain normal circulating blood level, production of 100 billion neutrophils /day is necessary. Half life of transfused platelet is 4 daysQ