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': 'Constituents of black gun powder is all EXCEPT: \nSelect and explain. \nA. Charcoal, B. KNOB, C. Lead peroxide, D. Sulphur', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Lead Peroxide Smokeless gun powder is composed of nitrocellulose & nitroglycerineQ. Smoke producing black gun powder contains "PCS" i.e. potassium nitrate charcoal and sulfurQ. It is described as FG, FFG, FFFG depending on the fineness (F)/size of grain (G).', 'role': 'assistant'}]