Immunologic Tolerance Is Defined As

Multiple Choice

Immunologic tolerance is defined as:

A) The removal of an antigen,or the microbes expressing the antigen,by the immune system,so that the host can tolerate the infection
B) Activation of only B cells,and not T cells,on exposure to an antigen
C) Unresponsiveness of the immune system to an antigen,which is induced by previous exposure to that antigen
D) The production of memory B cells and T cells on primary exposure to an antigen,which allows the host to tolerate a secondary exposure to the antigen
E) Vaccination of individuals against particular pathogens to prevent subsequent infections