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
Preventable cuses of mental retardation are - 
Select and explain. 
A. Downs, B. Phenylketonuria, C. Cretinism, D. Cerebral palsy
C: Cretinism
Answer: C: Cretinism 
Explanation: Ans. is `c' i.e., Cretinism Cretinism is due to deficiency of Iodine, which can be preventable.