Bone marrow is included in:

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(C) Lymphoid organs are the sites where origin and/or maturation and proliferation of lymphocytes occur.Primary lymphoid organs include the bone marro

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Primary lymphoid organs.

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(C) Lymphoid organs are the sites where origin and/or maturation and proliferation of lymphocytes occur.Primary lymphoid organs include the bone marrow and the thymus.In these organs,immature lymphocytes differentiate into antigen-sensitive lymphocytes.After maturation,the lymphocytes migrate to secondary lymphoid organs like the spleen,lymph nodes,tonsils,Peyer's patches of the small intestine,and the appendix.Therefore,bone marrow is classified as a primary lymphoid organ.

Column-$I$	Column-$II$
$P$. Physical barriers	$I$. Acid in stomach,saliva in mouth,tears from eyes
$Q$. Physiological barriers	$II$. Skin,mucus coating of epithelium lining the respiratory,gastrointestinal and urogenital tracts
$R$. Cellular barriers	$III$. Interferons
$S$. Cytokine barriers	$IV$. Polymorphonuclear leukocytes ($PMNL$-neutrophils),monocytes,$NK$ cells,macrophages

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