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: Biochemistry
[{'content': 'Main enzyme for glycogen metabolism ? \nSelect and explain. \nA. Glucose-6-phosphatase, B. Glycogen synthase, C. PFK - 1, D. None of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Glycogen synthase", 'role': 'assistant'}]