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
[{'content': 'Composition of Hyaluronic acid \nSelect and explain. \nA. N-acetyl glucosamine + b glucosamine acid, B. N-acetyl glucosamine + b-glucoraunic acid, C. N-acetyl glucosamine + sulfated glucosamine acid, D. N-acetyl glucosamine + iduranic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Composition of hyaluronic acid: repeating units of N-Acetyl-glucosamine and beta-1,4-Glucuronic acid.Ref: DM Vasudevan, 7th edition, page no: 80', 'role': 'assistant'}]