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: Biochemistry
Keratan sulfate I and II is found in 
Select and explain. 
A. Cornea, B. Cartilage, C. Loose connective tissue, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Biologically Important GAGs: