This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology, Subject name: Medicine
[{'content': 'Which is indicative of rain drop pigmentation? \nSelect and explain. \nA. Mercury poisoning, B. Cadmium poisoning, C. Antimony poisoning, D. Arsenic poisoning', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Arsenic poisoning.', 'role': 'assistant'}]