Question

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

tonsil

spleen

peyers patch

red bone marrow

thymus

Explanation:

To determine the primary lymphoid organ for B - cell maturation, we analyze each option:

• Tonsil: It is a secondary lymphoid organ, involved in local immune responses in the throat, not B - cell maturation.
• Spleen: A secondary lymphoid organ that filters blood and responds to blood - borne antigens, not for B - cell maturation.
• Peyer's patch: Secondary lymphoid tissue in the intestine, involved in gut - associated immunity, not B - cell maturation.
• Red bone marrow: Primary lymphoid organ where B cells mature. Hematopoietic stem cells in red bone marrow differentiate into B cells and mature there.
• Thymus: Primary lymphoid organ for T - cell maturation, not B - cell.

Answer:

D. Red bone marrow