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': 'Dimercaprol is/are used in poisoning with: \nSelect and explain. \nA. Pb, B. Hg, C. As, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Pb; B i.e. Hg; C i.e. As', 'role': 'assistant'}]