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
All are alkaloids, except: BHU 10 
Select and explain. 
A. Morphine, B. Physostigmine, C. Atropine, D. Abrine
D: Abrine
Answer: D: Abrine 
Explanation: Ans. Abrine