This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Pupil dilatation is seen in poisoning with \nSelect and explain. \nA. Dhatura, B. Ethyl alcohol, C. Barium carbonate, D. Barbiturates', 'role': 'user'}, {'content': "Answer: A \nExplanation: Miosis: Opium, Morphine, Organophosphorus, Barbiturates Mydriasis: Alcohol, Datura, Carbon monoxide, Cocaine Ref: K.S.Narayan Reddy's Synopsis of Forensic Medicine and Toxicology, 29th edition, section 2-Toxicology .", 'role': 'assistant'}]