This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
[{'content': "Locard's Principle is concerned with(2018) \nSelect and explain. \nA. Theory of exchange, B. Criminal responsibility for insane, C. Calculating age of fetus, D. Firearm wounds of skull", 'role': 'user'}, {'content': "Answer: A \nExplanation: Locard's Exchange Principle: When any two objects come into contact, there is always a transfer of material from each object on the other. Trace from the scene may be carried away on the person or tool of the criminal, and at the same time, 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. e.g., fingerprints, footprints, hair, fibres from clothes. broken glass, tool marks, paints, scratches, blood or seminal stains, etc. It is actual evidence, and its presence is absolute proof of the crime. Ref:- k.s.narayan reddy; pg num:- 475", 'role': 'assistant'}]