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': 'Universal antidote contains the following, except: COMEDK 13 \nSelect and explain. \nA. Powdered charcoal, B. Tannic acid, C. Ground mustard, D. Magnesium oxide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Ground mustard', 'role': 'assistant'}]