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: Pediatrics
[{'content': 'Pigmentation and growth retardation is seen in? \nSelect and explain. \nA. Zinc deficiency, B. Riboflavin deficiency, C. Niacin deficiency, D. Vit A deficiency', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Zinc dificiency", 'role': 'assistant'}]