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: Dental
[{'content': 'Rain drop pigmentation is seen in – \nSelect and explain. \nA. Chronic lead poisoning, B. Chronic Arsenic poisoning, C. Chronic Mercury poisoning, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rain drop pigmentation is characteristic of chronic arsenic poisoning.', 'role': 'assistant'}]