This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries, Subject name: Forensic Medicine
Detonator cap is situated at - 
Select and explain. 
A. Top of bullet, B. Side of the bullet case, C. Base of the rim, D. None of the above
C: Base of the rim
Answer: C: Base of the rim 
Explanation: Ans. is 'c' i.e., Base of the rim * Centre of base has percussion cap (detonator cap) which has sensitive composition, i.e., primer, consisting of potassium chlorate, antimony sulphide, mercury fulminate, barium nitrite, lead peroxide or tetrazene.* Cartridge case of shot gun is filled in following order (Starting from base)# Percussion (detonator) cap or primer battery cup.# Gun powder# Thick felt wad with carboard discs lying in front and behind.# Lead shot# Retaining cardboard (overshot/top-wad)