This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trace evidences, Subject name: Forensic Medicine
[{'content': 'In case of rape victim vaginal swab is taken within? \nSelect and explain. \nA. 2 days, B. 3 days, C. 4 days, D. 7 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: According to the Guidelines (given by Ministry of Health and family welfare for rape victim examination): Vaginal swab should be taken within 72hrs , after this time period chances of demonstration of sperm (which might be a potential evidence) are very less.', 'role': 'assistant'}]