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
Enzyme deficients in von gierke&;s disease 
Select and explain. 
A. Glucose 1 phosphatase, B. Glucose 6 phosphatase, C. Acid maltase, D. b Glucosidase
B: Glucose 6 phosphatase
Answer: B: Glucose 6 phosphatase 
Explanation: Repreated question