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
When a person comes in contact with other there is transfer of material from one to another. This is called: 
Select and explain. 
A. Locard's principle, B. Quetlets rule, C. Petty's principle, D. None of the above
A: Locard's principle
Answer: A: Locard's principle 
Explanation: Locards principle of exchange states that when two objects come into contact with each other, there is always some transfer of maternal from one to the other. Ref: Parikh's Textbook of Medical Jurisprudence Forensic Medicine and Toxicology, 6th Edition, Pages 5.35, 7.35