Task: Text Categorization
Input (English): Question: Different cytokines induce the isotype change of the different classes of antibodies. Of the following cytokine / isotype pairs, choose the correct one: 
 Options:  <0> IL-4 / IgE. <1> IL-4 / IgM. <2> IL-5 / IgG. <3> IFN- / IgM. <4> TGF- / IgA.
Output (English): pharmacology