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
Pupil condition in opium poisoning - 
Select and explain. 
A. Miosis, B. Mydriasis, C. Irregular, D. No change
A: Miosis
Answer: A: Miosis 
Explanation: Ref: K.S.Narayan Reddy's Synopsis of Forensic Medicine and Toxicology, 29th edition, Chapter 29,page 324.