This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pediatrics
[{'content': 'Preventable causes of Mental Retardation are \nSelect and explain. \nA. Downs, B. Phenylketonuria, C. Cretinism, D. Cerebral palsy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cretinism is congenital iron deficiency syndrome which can be preventable by intake in required amounts. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]