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
Rain drop pigmentation is seen in – 
Select and explain. 
A. Chronic lead poisoning, B. Chronic Arsenic poisoning, C. Chronic Mercury poisoning, D. All of the above
B: Chronic Arsenic poisoning
Answer: B: Chronic Arsenic poisoning 
Explanation: Rain drop pigmentation is characteristic of chronic arsenic poisoning.