This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
MPS without corneal clouding is? 
Select and explain. 
A. Hurler's disease, B. Hunter's disease, C. sly syndrome, D. Maroteaux Lamy syndrome
B: Hunter's disease
Answer: B: Hunter's disease 
Explanation: None