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': 'Chitin contains \nSelect and explain. \nA. Alpha 1-4 bond, B. b-1-6 bond, C. Alfa 1-6 bond, D. b-1-4 bond', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is present in exoskeletons of crustacea and insects. It is composed of units of N-acetyl-glucosamine with beta -1,4-glycosidic linkage.Ref: DM Vasudevan, page no: 79', 'role': 'assistant'}]