This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and Investigations, Subject name: Forensic Medicine
[{'content': "Locard's principle is famous for: \nSelect and explain. \nA. Theory of exchange, B. Fingerprint study, C. Formula for estimation of stature, D. System of personal identification using the body measurement", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. a. Theory of exchangeRef: APC Essentials of Forensic Medicine and Toxicology by Anil Aggrawal; Page No- 426 and Essential of Forensic Medicine and Toxicology, KSN Reddy, 33rd Ed; Page No-475Locard's Exchange principle states that when any two objects come into contact there is always a transfer of material from each object on to the other.This principle is often used as a sure proof of crime.The principle was first enunciated by Edmond Locard (1877-1996), often referred to as the Sherlock Holmes of France.", 'role': 'assistant'}]