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

What percentage of lymphoid tissue in the human body is constituted by $MALT$ (in $\%$)?

Which memory cells are produced during vaccination?

Assertion: Interferons are a type of antibodies produced by body cells infected by bacteria.
Reason: Interferons stimulate inflammation at the site of injury.

Which of the following is the correct representation of an antibody molecule?

After maturation,in primary lymphoid organs,the lymphocytes migrate for interaction with antigens to secondary lymphoid organs like:
$A.$ thymus $B.$ bone marrow $C.$ spleen $D.$ lymph nodes $E.$ Peyer's patches
Choose the correct answer from the options given below: