The antibodies are formed in

Which of the following requires the injection of preformed antibodies or antitoxins into the body to provide immunity?

Given below are two statements:
Statement $I$: Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.
Statement $II$: Both bone marrow and thymus provide micro-environments for the development and maturation of $T$-lymphocytes.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which antibody is obtained by the fetus from the placenta to provide immunity?

Innate immunity is defined as.........

Viruses infect host cells. By the induction of viruses,the host cells produce which of the following?