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 which is not regulated by phosphorylation dephosphorylation ? 
Select and explain. 
A. Glycogen synthase, B. Glycogen phosphorylase, C. Aspaate transcarboxylase, D. HMG CoA reductase
C: Aspaate transcarboxylase
Answer: C: Aspaate transcarboxylase 
Explanation: Ans. is 'c' i.e., Aspaate transcarboxylase