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': 'Compressed air is used to fire lead slugs in - \nSelect and explain. \nA. Automatic pistol, B. Revolver, C. Air gun, D. Shot gun', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Air pistol and air guns release lead shots or pellets which are propelled by air compressed in a cylinder.\nIn other weapons, projectiles are ejected by high pressure due to rapid formation expanding hot gases.', 'role': 'assistant'}]