This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Pyridoxal phosphate is needed in: \nSelect and explain. \nA. Glycogenolysis, B. Fatty acid oxidation, C. Glvcogenesis, D. Gluconeogenesis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans-A Ref: Harper's Illustrated Biochemistry,28th edition Explanation: Glycogenolysis is the breakdown of glycogen. Glycogen Phosphorylase catalyzes the phosphorolytic cleavage of the (l-4) glycosidic linkages of glycogen, releasing glucose-1- phosphate as the reaction product. Glycogen (n residues)+ Pi - glycogen (n-1 residues) + glucose-1-phosphate Pyridoxal phosphate (PLP), a derivative of vitamin B6. serves as the prosthetic group for Glycogen Phosphorylase. Pyridoxal phosphate (PLP) is held at the active site with the e-amino group of a lysine residue.", 'role': 'assistant'}]