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
[{'content': 'Which of the following is associated with a choking device? \nSelect and explain. \nA. Pistol, B. Revolver, C. Shot gun, D. Spos rifle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Choking is a constricting device present at the muzzle end of a shot gun. The purpose of choking is to lessen the rate of spread of shot after it leaves the muzzle, increase the explosive force and increase the velocity. Different degrees of choke are there like full choke, three quaer choke, half choke, quaer choke and improved cylinder.', 'role': 'assistant'}]