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
Active principle of oleander plant is: NEET 14; AIIMS 14 
Select and explain. 
A. Cannabinol, B. Atropine, C. Semicarpol, D. Nerin
D: Nerin
Answer: D: Nerin 
Explanation: Ans. Nerin