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Q.

Which of the following is not a secondary lymphoid organ in the immunity system?

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a

Spleen

b

Thymus

c

Peyer's patches

d

Appendix

answer is B.

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Detailed Solution

Primary lymphoid organs: These organs include the bone marrow and the thymus. They create special immune system cells called lymphocytes. 
Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils and certain tissue in various mucous membrane layers in the body.

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