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': 'Von Gierkes disease is due to deficiency of? \nSelect and explain. \nA. Branching enzyme, B. Debranching enzyme, C. Phosphorylase, D. Glucose 6 phosphatase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]