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
[{'content': 'A child presents with perioral rash and pigmentation of palmar area. What is the cause? \nSelect and explain. \nA. Selenium deficiency, B. Manganese deficiency, C. Copper deficiency, D. Zinc deficiency', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Option A: Selenium deficiency shows cardiomyopathy.\nOption B: Manganese deficiency presents with hypercholesterolemia and weight loss.\nOption C: Copper deficiency leads to neurological manifestations.', 'role': 'assistant'}]