Final answer:
Secondary lymphoid tissues, where immune responses occur, include the spleen, lymph nodes, Peyer's patches, and mucosa-associated lymphoid tissue. Bone marrow is a primary lymphoid tissue where lymphocytes are produced and mature.
Step-by-step explanation:
The question refers to secondary lymphoid tissues, which are part of the immune system. These tissues include the spleen, lymph nodes, Peyer's patches, and mucosa-associated lymphoid tissue (MALT). Unlike primary lymphoid tissues, which comprise the bone marrow and thymus where lymphocytes are produced and mature, secondary lymphoid tissues are where immune responses are coordinated and adaptive immune responses occur. In these tissues, lymphocytes encounter antigens and become activated to fight infections.
Bone marrow is an example of primary lymphoid tissue, not secondary lymphoid tissue. Therefore, options a (Bone marrow) and e (A & B) would be examples of primary, rather than secondary, lymphoid tissues. The rest of the options—b (Lymph nodes), c (Spleen), and d (Peyer's patches)—are all examples of secondary lymphoid tissues.