This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexual offences and infanticide, Subject name: Forensic Medicine
[{'content': 'Locard exchange of principle is \nSelect and explain. \nA. Detecting poisoning, B. Estimating age, C. Finding out time since death, D. Detecting crime', 'role': 'user'}, {'content': 'Answer: D \nExplanation: LOCARDS PRINCIPLE OF EXCHANGE: When any two objects come into contact, there is always a transfer of material from each object to the other. Traces from the scene may be carried away by the person and same traces from all or any of these may be left at the scene. Wherever a criminal goes whatever he touches and whatever he leaves will serve as silent evidence against him eg., fingerprints footprints, hair fiber from clothing, broken glasses, tool marks, paints scratch blood or seminal fluids, etc., It is actual evidence and its presence is absolute proof of the crime. REF: THE SYNOPSIS OF FORENSIC MEDICINE AND TOXICOLOGY 29th edition page no: 253.', 'role': 'assistant'}]