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': 'In which of the following tissues, is glycogen incapable of contributing directly to blood glucose? \nSelect and explain. \nA. Liver, B. Muscle, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Only liver can replenish blood glucose through gluconeogenesis because glucose-6-phosphatase is present mainly in liver.Ref: DM Vasudevan, 7th edition', 'role': 'assistant'}]