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': 'Plumbism is due to chronic poisoning with: PGI 09 \nSelect and explain. \nA. Arsenic, B. Lead, C. Mercury, D. Copper', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Lead', 'role': 'assistant'}]