Task: Text Categorization
Input (English): Question: It usually protects the DNA of a restriction enzyme: 
 Options:  <0> Methylation of a nitrogenous base. <1> Glycosylation of a nitrogenous base. <2> Acetylation of deoxyribose. <3> Phosphorylation of deoxyribose. <4> Loss of one of the hydroxyl groups of phosphate.
Output (English): biology