This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Biochemistry
[{'content': 'Mucopolysaccharides in eye are: \nSelect and explain. \nA. Keratan sulfate - I and Hyaluronic acid, B. Keratan sulfate - I and Heparan sulfate, C. Chondroitin sulfate and Keratan sulfate - II, D. Chondroitin sulfate and Dermatan sulfate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MUCOPOLYSACCHARIDES - heteroglycans made up of repeating units of sugar derivatives, namely amino sugars and uronic acids. These are more commonly known as glycosaminoglycans (GAG).', 'role': 'assistant'}]