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': 'A factory worker presented with tremors, personality change and a blue line in gums. Probable diagnosis is chronic poisoning with: Al 10 \nSelect and explain. \nA. Lead, B. Mercury, C. Arsenic, D. Thallium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Mercury', 'role': 'assistant'}]