The figure given below shows an antibody molecule. Name the parts $A, B$ and $C$.

Which of the following is $NOT$ included in innate immunity?

Identify the receptors present on $T_{H}$ cells and $T_{C}$ cells,respectively.

Which protein is secreted by animal cells in response to viral infection?

Given below are two statements:
Statement $I:$ Autoimmune disorder is a condition where the body's defense mechanism recognizes its own cells as foreign bodies.
Statement $II:$ Rheumatoid arthritis is a condition where the body does not attack self-cells.
In the light of the above statements,choose the most appropriate answer from the options given below:

$A$: Live attenuated vaccine is better in terms of immunity provided to the recipient.
$R$: As secondary lymphoid organs,example $Peyer's$ patches are stimulated to protect the individual.