What is the full form of $CMI$?

Assertion: Artificially acquired passive immunity results when antibodies or lymphocytes produced outside the host are introduced into a host.
Reason: $A$ bone marrow transplant given to a patient with genetic immunodeficiency is an example of artificially acquired passive immunity.

Which of the following are secondary lymphoid organs?
$(a)$ Bone marrow
$(b)$ Tonsils
$(c)$ Spleen
$(d)$ Thymus
Choose the correct answer from the options given below:

Which of the following is a primary lymphoid organ?

What is immunity based on?

Which cells secrete interferons?