This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Law & Medicine, Identification, Autopsy & Burn, Subject name: Forensic Medicine
Presence of spiral grooves in the barrel of w eapon is referred to as - 
Select and explain. 
A. Rifling, B. Incendiary, C. Cocking, D. None of the above
A: Rifling
Answer: A: Rifling 
Explanation: Ans. is 'a' Le., Rifling Type of firearm weaponso Bore (caliber) is the inner diameter of barrel. Based on inside of barrel (i.e., bore), the firearm weapons are divided into:-Smooth bore weapons : Barrel or bore is smooth inside, e.g., shot gun, muskets, and muzzle loaders.Rifled weapons : Barrel or bore is rifled from inside, i.e., has longitudinally twised grooves. Example are : Pistals, rifles and revolvers.o Pistals and revolvers are small, so referred to as hand guns.