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': 'After ejaculation into vagina sperm retains motility for ? \nSelect and explain. \nA. 24hrs, B. 36hrs, C. 72 hrs, D. 1 week', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., 24hrs"In ejaculated semen the maximum life span of sperm is 24-48 hours at body temperature". -- Indu Khurana', 'role': 'assistant'}]