Task: Text Categorization
Input (English): Question: The simultaneous expression of IgM and IgD as membrane immunoglobulins occurs in: 
 Options:  <0> B cells that respond to thymoindependent antigens. <1> B cells that respond to thymus-dependent antigens. <2> Activated B cells stimulated by Interleukin 4 (IL-4). <3> Immature virgin B cells. <4> Mature virgin B cells.
Output (English): pharmacology