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: Pharmacology
[{'content': 'A 35 year old man was found unconscious. Examination revealed bilateral constricted pupils, bradycardia, excessive sweating and secretion. Most likely cause is: \nSelect and explain. \nA. Opium poisoning, B. Acute alcohol intoxication, C. Organophosphorous poisoning, D. Pontine hemorrhage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]