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
[{'content': 'Which of the following is not a constituent of universal antidote? \nSelect and explain. \nA. Activated charcoal, B. Tannic acid, C. Magnesium oxide, D. Potassium permanganate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Universal antidote is a mixture of activated charcoal,tonnic acid and magnesium oxide.', 'role': 'assistant'}]