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
Muscle cannot make use of glycogen for energy because of deficiency of 
Select and explain. 
A. Glucokinase, B. Phosphoglucomutase, C. G-6-phosphatase, D. Muscle phosphorylae
C: G-6-phosphatase
Answer: C: G-6-phosphatase 
Explanation: Muscle doesn&;t contain glucose -6-phosphate. only liver contain. Glucose -6-phosphatase hydrolyze glycose-6-phosphate into glucose and released into the blood.Ref: DM Vasudevan, 7th edition