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': 'Activated charcoal is used in: \nSelect and explain. \nA. Alcohol, B. Barbiturate, C. Heavy metal poisoning, D. Lead poisoning', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Barbiturate', 'role': 'assistant'}]