Which of the following does not provide immunity?

Which of the following organs is a primary lymphoid organ?

What does the indicated part in the given figure represent?

In the case of tetanus,a patient is directly injected with antitoxins. This type of immunity is called .........

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:

After an organ transplant from an unrelated donor,which of the following plays the lead role in graft rejection?