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
Associated with shotguns only: AFMC 12 
Select and explain. 
A. Gunpowder, B. Primer, C. Projectile, D. Wads
D: Wads
Answer: D: Wads 
Explanation: Ans. Wads