Which of the following is not a secondary lym | vedclass

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(A) Lymphoid organs are classified into primary and secondary lymphoid organs.Primary lymphoid organs include the bone marrow and thymus,where immatur

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Thymus

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(A) Lymphoid organs are classified into primary and secondary lymphoid organs.Primary lymphoid organs include the bone marrow and thymus,where immature lymphocytes differentiate into antigen-sensitive lymphocytes.Secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen,which then proliferate to become effector cells.Examples of secondary lymphoid organs include the spleen,lymph nodes,tonsils,Peyer's patches of the small intestine,and appendix.Since the thymus is a primary lymphoid organ,it is not a secondary lymphoid organ.

List-$I$ (Barrier)	List-$II$ (Example)
$A$. Physical barrier	$i$. Skin
$B$. Physiological barrier	$ii$. Interferons
$C$. Cellular barrier	$iii$. Mucus coating
$D$. Cytokine barrier	$iv$. Saliva in mouth

Which of the following is not a secondary lymphoid organ?

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