In vaccination,which of the following is introduced into the body?

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 $:$

The immune system:

$IFN$ (Interferons) are . . . . . . ?

The development of a quick immune response in a person infected with deadly microbes by administering preformed antibodies is known as:

If you suspect a major deficiency of antibodies in a person,to which of the following would you look for confirmatory evidence?