This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology, Subject name: Forensic Medicine
[{'content': 'Marking nut is \nSelect and explain. \nA. Semicarpus anacardium, B. Croton tiglium, C. Areca catechu, D. Abrus precatorius', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Semicarpus anacardium Semicarpus anacardium (marking nut or bhilawan)* Its seed are heart shaped, conical and black with acrid oily juice which is brownish but turns black on exposure to air. Active principles are semecarpol and bhilawanol.* Juice applied to skin produces irritation, painful blisters followed by itching and eczema. Therefore it is used to produce artificial bruises.* It is also used by washerman to mark clothes.", 'role': 'assistant'}]