Question

which of the following is a primary lymphatic organ?
a lymph node
b spleen
c thymus
d tonsil

Explanation:

Primary lymphatic organs are where lymphocytes are produced and matured. The thymus is a primary lymphatic organ (T - cells mature here). Lymph nodes, spleen, and tonsils are secondary lymphatic organs (involved in immune responses, not lymphocyte maturation).

Answer:

C. Thymus