This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Locard’s principle is concerned: \nSelect and explain. \nA. Theory of relativity, B. Theory of decomposition, C. Theory of trauma, D. Theory of exchagnge', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref. Textbook of forensic medicine. Krishnan Vij. Page. 302\n\xa0\nLocard Principle:\n\nWhen any two objects come into contact, there is always a transfer of material from each object on the other.\nSome examples are fingerprints, footprints,hair, tool marks etc.', 'role': 'assistant'}]