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': 'Tattooing in entry wound of a firearm injury is due to: NEET 14 \nSelect and explain. \nA. Burns, B. Smoke, C. Gunpowder, D. Wads', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans./ Gunpowder', 'role': 'assistant'}]