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 condition in opium poisoning - \nSelect and explain. \nA. Miosis, B. Mydriasis, C. Irregular, D. No change', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ref: K.S.Narayan Reddy's Synopsis of Forensic Medicine and Toxicology, 29th edition, Chapter 29,page 324.", 'role': 'assistant'}]