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 any two objects come in contact there is always a transference of material from each object on to the other. This is called : 
Select and explain. 
A. Locard's exchange principle, B. Corpus fouling, C. Metallic fouling, D. Rule of Haase
A: Locard's exchange principle
Answer: A: Locard's exchange principle 
Explanation: A i.e. Locard's principle