In most cases, adaptive immune responses rely on the initial activation of in secondary lymphoid tissue:

This question lacks options, options are: a. macrophages

b. T cells

c. B cells

d. dendritic cells

e. epithelium

The correct answer is c.  

Explanation:

In the secondary lymphoid organs is where foreign substances or antigens are presented and the specific immune response begins. They are the lymph nodes, spleen, and MALT. The main function of B cells is the recognition of foreign molecules to the body, called antigens, and the production of specific antibodies to neutralize them. After maturation, B cells are central cells in the adaptive immune response, they agglomerate in the lymph nodes, spleen and other lymphoid tissues, where they will come into contact with the antigens for which they are specific.

the answer is cell division : )