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': 'Tattoing in entry wound of a firearm injury is due to? \nSelect and explain. \nA. Burning, B. Smoke, C. Gun powder, D. Wads', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Gun powder", 'role': 'assistant'}]