This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Mental retardation is not a feature of one of the following Mucopolysaccharidosis? \nSelect and explain. \nA. Hurler MPS-I, B. Hunter MPS -II, C. Sanfillipo MPS -III, D. Morquio MPS --IV', 'role': 'user'}, {'content': "Answer: D \nExplanation: Features of Morquio MPS-IV:HepatosplenomegalySkeletal dysplasia, odontoid hypoplasiaCorneal cloudingGranulated neutrophilsAoic valve diseaseNo mental retardation(Ref: Harrison's 18/e p2452, table 355-1)", 'role': 'assistant'}]