This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzyme regulation, Subject name: Biochemistry
[{'content': 'All of the following are covalent modifications of enzyme regulation EXCEPT: \nSelect and explain. \nA. Phosphorylation, B. ADP Ribosylation, C. Acetylation, D. Glycosylation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Various ways of covalent modifications of enzymes are : Most common is Phosphorylation and Dephosphorylation ADP Ribosylation, Methylation, Acetylation', 'role': 'assistant'}]