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': 'Following statements are true with respect to glycogen except \nSelect and explain. \nA. Principle storage of carbohydrate in the human body is glycogen, B. Liver and muscle are the main sites of glycogen storage, C. Produced by glycogenesis, D. Insulin stimulates glycogenolysis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Insulin inhibits glycogenolysis by oring the inactivation of glycogen phosphorylase and inhibiting glucose-6-phosphatase. The net effect of all these three mechanisms, blood glucose level is lowered.Ref: DM Vasudevan, 7th edition, page no: 321', 'role': 'assistant'}]