Task: Question Answering
Input (English): Question: On the link between the nitrogenous base and the ribose of the nucleotides: 
 Options:  <1> The anomeric carbon of ribose is in alpha configuration. <2> It is an N-glycosidic bond. <3> It involves the C5' of the ribose. <4> It involves phosphate groups. <5> It is of a different nature for each nitrogenous base.
Output (English): 2