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
Key glycolytic enzymes are all except: 
Select and explain. 
A. PFK, B. Hexokinase, C. Pyruvate kinase, D. Glucose 1,6-phosphatase
D: Glucose 1,6-phosphatase
Answer: D: Glucose 1,6-phosphatase 
Explanation: None