This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology, Subject name: Forensic Medicine
Tattoing in entry wound of a firearm injury is due to- 
Select and explain. 
A. Burning, B. Smoke, C. Gun powder, D. Wads
C: Gun powder
Answer: C: Gun powder 
Explanation: Ans. is 'c' i.e., Gun powder AssociateInjury causedRange1. FlameBuring (Singeing) of hair Buring/melting/ironing of clothesShot gun -15 cm Rifled weapon - 8 cm2. HeatScrotching of skinShot gun -15 cm Rifled weapon - 8 cm3. Smoke and carbon particlesBlackeing Smoke deposition (Smudging/fouling)30 cm4. Gun powder (unburnt and partly burnt)Tattooing (stippling/pepping)60 - 90 cm5. Wads (in shotgun)Abrasion/contusion5 yards