Task: Text Categorization
Input (English): Question: The primary function of interleukin 2 (IL-2) is: 
 Options:  <0> Induce activation of macrophages. <1> Promote isotype changes in immunoglobulins produced by activated B cells. <2> Induce the synthesis of acute phase proteins by hepatocytes. <3> Promote the proliferation of T lymphocytes <4> Promote the proliferation of B lymphocytes
Output (English): pharmacology