Which of the following immune responses is responsible for rejection of kidney graft?

What are pathogens ?
 

Humans have acquired immune system that produces antibodies to neutralize pathogens. Still innate immune system is present at the time of birth because it

$B$-cells are lymphocytes which produce the humoral immunity. These cells are produced by

Some people who have suffered from a disease may not be affected again during their life time; such immunity is called

provides passive immunity