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': 'Choking is constricting device within the barrel at the muzzle end of : \nSelect and explain. \nA. Revolver, B. 303 rifle, C. Shot gun, D. Semiautomatic pistol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Shot gun', 'role': 'assistant'}]