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': 'Preventable cuses of mental retardation are - \nSelect and explain. \nA. Downs, B. Phenylketonuria, C. Cretinism, D. Cerebral palsy', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is `c' i.e., Cretinism Cretinism is due to deficiency of Iodine, which can be preventable.", 'role': 'assistant'}]