Task: Text Categorization
Input (English): Question: The phosphodiester bond: 
 Options:  <0> It is formed by attack from a nitrogenous base to a phosphate. <1> It is formed using NMP as a substrate. <2> In its training PPi is consumed. <3> It involves an alpha phosphate of one nucleotide and an OH group of the ribose of another. <4> It does not need enzymatic catalysis.
Output (English): biology