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': 'Enzymes in glycogen metabolism \nSelect and explain. \nA. Phosphorylase a, B. Phosphorylase b, C. Glycogen Synthase II, D. Glycogen Synthase C', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The liver phosphorylase-b is the inactive form. It becomes active on phosphorylation. The active enzyme is denoted as phosphorylase-a.Ref: DM Vasudevan, page no: 127', 'role': 'assistant'}]