A) the cortical sinus
B) efferent lymphatic vessel
C) afferent lymphatic vessel
D) none of the above

A) T cells are the precursors to B cells.
B) B cells produce plasma cells, which secrete antibodies into the blood.
C) The two main types of lymphocytes are T cells and macrophages.
D) None of the above statements are correct.

A) acting as a lymph filter
B) producing lymph
C) producing lymphoid cells
D) none of the above