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
Histone has post-translational modification by all /except 
Select and explain. 
A. Acetylation, B. methylation, C. Phosphorylation, D. Glycosylation
D: Glycosylation
Answer: D: Glycosylation 
Explanation: Amino-terminal tails of histones are available for regulatory covalent modification by Acetylation, phosphorylation, ADP-ribosylation, methylation, monoubiquitylation and sumoylation.

Note:- Sumoylation means conjugation with SUMO (i.e. small ubiquitin-related modifier).