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
Example of postranslational modification is 
Select and explain. 
A. Methylation, B. Oxidation, C. Phosphorylation, D. Splicing
C: Phosphorylation
Answer: C: Phosphorylation 
Explanation: Ans. is 'c' i.e.,Phosphorylation Impoant post-translational modifications are :TrimmingCovalent modification : Phosphorylation, glycosylation hydroxylation, y-Carboxylation of clotting factor by vitamin K.Protein folding and Protein degradation