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
ingredient of marking nut is: NEET 14 
Select and explain. 
A. Semecarpol, B. Croton, C. Abrin, D. Ricin
A: Semecarpol
Answer: A: Semecarpol 
Explanation: Ans. Semecarpol