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: Gynaecology & Obstetrics
[{'content': 'Motile spermatozoa found on a wet mount of vaginal secretions are indicative of intercourse within the past : \nSelect and explain. \nA. 6 hours, B. 12 hours, C. 24 hours, D. 48 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 24 hours', 'role': 'assistant'}]