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
Which of the following is least narcotic: AIIMS 09 
Select and explain. 
A. Morphine, B. Codeine, C. Thebane, D. Papaverine
D: Papaverine
Answer: D: Papaverine 
Explanation: Ans. Papaverine