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': '. Muscle cannot make use of glycogen for energy because of deficiency of: \nSelect and explain. \nA. Glucokinase, B. Phosphoglucomutase, C. G-6-phosphatase, D. Muscle phosphorylase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. G- 6- Phosphatase', 'role': 'assistant'}]