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': 'Which of the following is least narcotic: AIIMS 09 \nSelect and explain. \nA. Morphine, B. Codeine, C. Thebane, D. Papaverine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Papaverine', 'role': 'assistant'}]