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: Skin
Which mineral causes skin allergy: March 2013 
Select and explain. 
A. Magnesium, B. Zinc, C. Copper, D. Nickel
D: Nickel
Answer: D: Nickel 
Explanation: Ans. D i.e. Nickel