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
In case of rape victim vaginal swab is taken within? 
Select and explain. 
A. 2 days, B. 3 days, C. 4 days, D. 7 days
B: 3 days
Answer: B: 3 days 
Explanation: 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.