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': 'Enzyme activated by covalent phosphorylation is \nSelect and explain. \nA. Glycogen phosphorylase, B. Acetyl CoA carboxylase, C. HMG CoA reductase, D. Pyruvate carboxylase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Glycogen phosphorylase removes glucose as glucose-1-phosphate from glycogen(phosphorolysis). It contains pyridoxal phosphate as a prosthetic group.Ref: DM Vasudevan, 7th edition, page no: 124', 'role': 'assistant'}]