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
Which is smooth bored weapon - 
Select and explain. 
A. Rifle, B. Shotgun, C. Revolver, D. Pistal
B: Shotgun
Answer: B: Shotgun 
Explanation: Smooth bored weapons Shotgun, muskets, and muzzle loaders.
Rifled weapons : Rifles, pistols, and revolvers.