Answer :
The white pulp of the spleen areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes. Hence, option D is correct.
What is a lymphoid?
The lymphoid organs include the red bone marrow, thymus, spleen and clusters of lymph nodes.
Both white and red pulp contains lymphocytes and immune cells called macrophages. These cells dispose of antigens, dead cells, and debris by engulfing and digesting them. While the spleen functions chiefly to filter blood, it also stores red blood cells and platelets.
Hence, The white pulp of the spleen areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes.
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