Which of the following cells act as phagocytes?

The interferon of other animals:

Interferons are ...........

Assertion $A$: Acquired immunity is characterized by memory. Reason $R$: The secondary immune response is highly intensified.

Which cells are responsible for active acquired immunity?

Regarding kidney transplantation,four statements are given below. Select the correct statements.
$i.$ During kidney transplantation,the recipient's immune system is suppressed for a long time.
$ii.$ Cell-mediated immunity is responsible for the rejection of the transplant.
$iii.$ $B$-lymphocytes are responsible for the rejection of the transplant.
$iv.$ Specific interferons are responsible for the acceptance or rejection of the kidney transplant.
Select the correct option: