Thymus is the site for the development and maturation of
$T-lymphocyte$
$B-lymphocyte$
$Both$ $(a)$ $and$ $(b)$
$ntibodies$
Antigen binding site in an antibody is found between
Spleen is
Given below the diagrammatic representation of lymph nodes
Label $A, B$ and $C$
Passive immunity can be obtained by injecting
The immune system which works against self is