Who is known as the father of passive immunity?

Which of the following is a non-specific type of defense that is present at the time of birth?

Assertion $A$: Vaccination protects an individual against infection by specific pathogens.
Reason $R$: $B$ and $T$ memory cells produce antibodies in large quantities to neutralize the pathogen attack.
Which option is correct for Assertion $A$ and Reason $R$?

$WBC$ is an example of

Which of the following is not a physiological barrier?

Helper $T$-cells : Lymphokines :: Killer $T$-cells : . . . . . . .