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': 'The enzyme deficient in Von-Gierke&;s disease is \nSelect and explain. \nA. Glucose-6-phosphatase, B. Acid maltase, C. Muscle phosphorylase, D. Liver phosphorylase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Repeated question', 'role': 'assistant'}]