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
[{'content': 'Histone has post-translational modification by all /except \nSelect and explain. \nA. Acetylation, B. methylation, C. Phosphorylation, D. Glycosylation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Amino-terminal tails of histones are available for regulatory covalent modification by Acetylation, phosphorylation, ADP-ribosylation, methylation, monoubiquitylation and sumoylation.\n\nNote:- Sumoylation means conjugation with SUMO (i.e. small ubiquitin-related modifier).', 'role': 'assistant'}]