Which types of cells are produced during the clonal selection of $B$-cells?

Read the following statements and choose the correct set of statements $:$
$(a)$ Cell-mediated immune response is responsible for the graft rejection.
$(b)$ Grafts from just any source $-$ an animal,another primate,or any human beings can be made since the grafts would be accepted sooner or later.
$(c)$ The organs cannot be taken from just anybody for transplant.
$(d)$ Tissue matching,blood group matching are essential before undertaking any graft/transplant.
Choose the correct answer from the options given below $:$

Which of the following is a pentameric immunoglobulin and is produced first in a primary response to an antigen?

What is immunity based on?

Acquired immunity is mediated by which of the following?

Match the Column-$I$ with Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$1$. Cellular barrier	$A$. Saliva in the mouth
$2$. Physiological barrier	$B$. Interferons
$3$. Cytokine barrier	$C$. Natural killer (type of lymphocyte)
$4$. Physical barrier	$D$. Mucus coating of the respiratory tract