Question

multiple choice question
which primary lymphoid organ is the site of b cell maturation?

tonsil
spleen
peyer’s patch
red bone marrow
thymus

Explanation:

To solve this, we recall the functions of primary lymphoid organs. Primary lymphoid organs are where lymphocytes mature. B cells mature in the red bone marrow. Tonsils, spleen, and Peyer’s patches are secondary lymphoid organs (where immune responses occur). The thymus is the site of T - cell maturation. So the primary lymphoid organ for B - cell maturation is red bone marrow.

Answer:

D. Red bone marrow (assuming the options are labeled A - E with A: Tonsil, B: Spleen, C: Peyer’s patch, D: Red bone marrow, E: Thymus)