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: Somatic recombination for the generation of diversity in B lymphocytes occurs in: 
 Options:  <1> Bone marrow. <2> Ganglion. <3> Peripherally blood. <4> Thymus <5> Spleen.
