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': 'Blood platelets in stored blood do not remain functional after ...... hrs. - \nSelect and explain. \nA. 24, B. 48, C. 72, D. 96', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 24", 'role': 'assistant'}]