Which of the Following Is/are Secondary Lymphoid Organ(s)

Question

Which of the following is/are secondary lymphoid organ(s)?
A) Thymus AND spleen
B) Spleen AND lymph nodes
C) Lymph nodes AND bone marrow
D) Spleen AND bone marrow
E) Thymus AND bone marrow

Accepted Answer

Secondary lymphoid organs are the organs where lymphocytes encounter and respond to antigens. The spleen and lymph nodes are both secondary lymphoid organs. The thymus and bone marrow are primary lymphoid organs where lymphocytes are produced and matured.