Task: Question Answering
Input (English): Question: The glycolic fraction of the glycolipids of the membrane of eukaryotic cells: 
 Options:  <1> It is located on the cytoplasmic side of the membrane. <2> It always has sialic acid. <3> They are synthesized by the action of several glycosyl transferases. <4> It is a glucose oligomer. <5> It has no antigenic power.
Output (English): 3