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: Forensic Medicine
[{'content': "When any two objects come in contact there is always a transference of material from each object on to the other. This is called : \nSelect and explain. \nA. Locard's exchange principle, B. Corpus fouling, C. Metallic fouling, D. Rule of Haase", 'role': 'user'}, {'content': "Answer: A \nExplanation: A i.e. Locard's principle", 'role': 'assistant'}]