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
[{'content': 'Keratan sulfate I and II is found in \nSelect and explain. \nA. Cornea, B. Cartilage, C. Loose connective tissue, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Biologically Important GAGs:', 'role': 'assistant'}]