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(A) 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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$C, D, E$ only

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(A) Lymphoid organs are the sites where origin and/or maturation and proliferation of lymphocytes occur.Primary lymphoid organs include the bone marrow and thymus,where immature lymphocytes differentiate into antigen-sensitive lymphocytes.After maturation,the lymphocytes migrate to secondary lymphoid organs.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 the appendix.Therefore,$C$ (spleen),$D$ (lymph nodes),and $E$ (Peyer's patches) are secondary lymphoid organs,while $A$ (thymus) and $B$ (bone marrow) are primary lymphoid organs.The correct option is $A$ ($C, D, E$ only).

After maturation,in primary lymphoid organs,the lymphocytes migrate for interaction with antigens to secondary lymphoid organs like:
$A.$ thymus $B.$ bone marrow $C.$ spleen $D.$ lymph nodes $E.$ Peyer's patches
Choose the correct answer from the options given below:

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After maturation,in primary lymphoid organs,the lymphocytes migrate for interaction with antigens to secondary lymphoid organs like:$A.$ thymus $B.$ bone marrow $C.$ spleen $D.$ lymph nodes $E.$ Peyer's patchesChoose the correct answer from the options given below: