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': 'Uronic acid pathway does not have role in formation of which glycosaminoglycan proteoglycan? \nSelect and explain. \nA. Keratan sulfate, B. Chondroitin sulphate, C. Hyaluronic acid, D. Heparan sulphate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Glycosaminoglycans are heteropolysaccharide (heteropolysaccharides are polysaccharides which contain two or more different monosaccharide unit or their derivates).Glycosaminoglycans are linear (unbranched) polysaccharides, with repeating diasaccharide units. Each disaccharide unit consists of an amino sugar and an acid sugar (sugar acid).', 'role': 'assistant'}]