Which one of the following are not considered as primary lymphoid organs? A Bone marrow and thymus B Bone marrow C Lymph nodes and tonsils D Thymus
OptionA. Secondary lymphoid organs include lymph nodes, spleen, tonsils, Peyer's patches and mucosa associated lymphoid tissue (MALT). From the above information we have found that thymus gland and bone marrow are primary lymphoid organs.
