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: Unknown
[{'content': 'Hemoperfusion with charcoal is useful in poisoning with: - \nSelect and explain. \nA. Phenytoin, B. Methyl alcohol, C. Lithium, D. Ethylene glycol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hemoperfusion should be considered in cases of severe poisoning due to', 'role': 'assistant'}]