This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mendalian Inheritance, Subject name: Biochemistry
CG region is involved in: 
Select and explain. 
A. Acetylation, B. Methylation, C. Phosphorylation, D. DNA Replication
B: Methylation
Answer: B: Methylation 
Explanation: CG region Methylation of cytosine By DNA Methyl Transferases (DNMTs) of CG site leads to gene inhibition. the most common mechanism of genomic imprinting.