Question

question 29
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which of the following is a primary lymphoid organ?
spleen
thymus
lymph node
cisterna chyli
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Explanation:

Primary lymphoid organs are sites where lymphocytes (white blood cells) develop and mature. The thymus is where T - lymphocytes mature. The spleen, lymph nodes, and cisterna chyli are secondary lymphoid organs. The spleen filters blood, lymph nodes filter lymph, and the cisterna chyli is a dilated sac at the lower end of the thoracic duct.

Answer:

Thymus