This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'Active ingredient of marking nut is - \nSelect and explain. \nA. Semecarpol, B. Crotin, C. Abrin, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Marking Nut Botanical name: Semicarpus anacardium Common name: Marking nut, bhilawa, biba Toxic Principle * Semecarpol * Bhilawanol REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO317', 'role': 'assistant'}]