Which of the following provides the microenvironment for the maturation of $T$-lymphocytes?

Which of the following is $NOT$ associated with the bone marrow?

Which of the following is the correct statement regarding $IgE$?

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:

Which of the following antibodies is primarily produced during the primary immune response?

Where are $H_{2}L_{2}$ molecules found in the body?