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': 'Lifespan of platelets and neutrophils is respectively \nSelect and explain. \nA. 8-9 days and 5 days, B. 120 days and 5 days, C. 5 days and 120 days, D. 5 days and 8-9 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Erythrocytes 120 days\nPlatelets 8-9 days\nNeutrophils 5 days', 'role': 'assistant'}]