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': 'EDTA is used for poisoning with: \nSelect and explain. \nA. Cyanide, B. Lead, C. Mercury, D. Phosphorus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mercury', 'role': 'assistant'}]