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
Enzyme regulated by phosphorylation are all except 
Select and explain. 
A. Glucokinase, B. Glycogen synthase, C. Glycogen phosphorylase, D. Citrate lyase
A: Glucokinase
Answer: A: Glucokinase 
Explanation: Examples of Mammalian Enzymes Whose Catalytic Activity Is Altered by Covalent Phosphorylation-Dephosphorylation: