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': 'A boy died in an emergency room with white froth in the mouth. The poisoning is due to - \nSelect and explain. \nA. Organophosphorus, B. Opium, C. HCN, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Froth near the mouth or nasal aperture may be\xa0due\xa0to death by drowning or some poisons like opium or organophosphorus.\nBlood mixed frothing\xa0from nose and mouth may be due to organophosphorus\xa0poisoning.\nDeath due to drowning or\xa0opium poisoning\xa0causes\xa0fine white copious leathery frothing.', 'role': 'assistant'}]