This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Genetics, Subject name: Biochemistry
[{'content': 'The following activity increases in DNA in a permissive chromatin: \nSelect and explain. \nA. Methylation of CpG islands, B. Phosphorylation, C. Acetylation of histones, D. Sumoylation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Acetylation of histonesEffects of epigenetic modificationMethylation of CpG islands-Repressive chromatinPhosphorylaion of histones-Chromatin condensation (Repressive chromatin) or opening of chromatin (Permissive chromatin)Acetylation of histones-Permissive chromatinSumoylation-Repressive chromatin', 'role': 'assistant'}]