Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: What serum immunoglobulin will synthesize an activated B lymphocyte that has not been stimulated through CD40 ?: 
 Options:  <1> Any. <2> IgE <3> IgM <4> IgA <5> IgG
