Read the following statements regarding the lymphoid organs in the human body: (A) MALT constitutes about 50 percent of the lymphoid tissue in the human body. (B) MALT is located within the lining of major tracts like respiratory, digestive and urogenital tracts. (C) Bone marrow and thymus are secondary lymphoid organs where lymphocytes interact with antigens. (D) The spleen is a large bean-shaped organ that mainly c

Step-by-step solution

Statement (A) is correct as Mucosa-Associated Lymphoid Tissue (MALT) constitutes about 50 percent of the lymphoid tissue in the human body. Statement (B) is correct as MALT is located within the lining of the major tracts (respiratory, digestive and urogenital tracts). Statement (C) is incorrect because bone marrow and thymus are primary lymphoid organs where immature lymphocytes differentiate into antigen-sensitive lymphocytes. Secondary lymphoid organs (like spleen, lymph nodes, tonsils) are the sites where lymph