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
Tattooing in entry wound of a firearm injury is due to: NEET 14 
Select and explain. 
A. Burns, B. Smoke, C. Gunpowder, D. Wads
C: Gunpowder
Answer: C: Gunpowder 
Explanation: Ans./ Gunpowder