Task: Text Categorization
Input (English): Question: When centrifuging human peripheral blood in a density gradient in Ficoll: 
 Options:  <0> The mononuclear cells float on the Ficoll. <1> The lymphocytes remain in the background. <2> The erythrocytes float on the Ficoll. <3> The granulocytes float on the Ficoll. <4> The monocytes remain in the background.
Output (English): biology