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
[{'content': 'Which mineral causes skin allergy: March 2013 \nSelect and explain. \nA. Magnesium, B. Zinc, C. Copper, D. Nickel', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Nickel', 'role': 'assistant'}]