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
Which is indicative of rain drop pigmentation? 
Select and explain. 
A. Mercury poisoning, B. Cadmium poisoning, C. Antimony poisoning, D. Arsenic poisoning
D: Arsenic poisoning
Answer: D: Arsenic poisoning 
Explanation: Ans. (d) Arsenic poisoning.