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': 'Industrial worker with blue lines on gums. Most probably due to: JIPMER 13 \nSelect and explain. \nA. Arsenic poisoning, B. Lead poisoning, C. Mercury poisoning, D. Copper poisoning', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Lead poisoning', 'role': 'assistant'}]