Question

question
which of the following are primary lymphatic organs?
answer
spleen and thymus gland
spleen and red bone marrow
thymus gland and tonsils
red bone marrow and thymus gland

Explanation:

Primary lymphatic organs are where lymphocytes (white blood cells) are produced and mature. The red bone marrow produces B - lymphocytes and is also involved in the early development of other blood cells. The thymus gland is where T - lymphocytes mature. The spleen is a secondary lymphatic organ (filters blood and is involved in immune responses but not the site of lymphocyte origin/maturation). Tonsils are also secondary lymphatic organs (part of the immune defense at mucosal surfaces but not primary sites of lymphocyte production/maturation).

Answer:

Red bone marrow and thymus gland