Question

Which of the following is not a major organ of lymphatic system?

• A. Lymph nodes
  
• B. Thymus
• C. Kidney
• D. Spleen

Answer 1

Answer: (C)

Kidney

Red bone marrow and thymus are the primary lymphatic organs where lymphatic stem cells produce lymphocytes while spleen is one of the secondary lymphatic organs which serve as the site of the encounter of lymphocytes with the antigens. Lymph nodes are the mass of lymphatic tissue located along the course of a lymphatic vessel and serve as secondary lymphatic organs wherein lymphocytes are activated by their exposure and binding to antigen. Kidneys are not part of the lymphatic system.

Therefore, the correct answer is option C.