All of the following are examples of mucosa-associated lymphoid tissue $(MALT)$ except:

Assertion $(A)$: The human body is exposed to a large number of infectious agents daily,yet only a few result in disease. Reason $(R)$: The human body possesses an immune system. Which option is correct for Assertion $(A)$ and Reason $(R)$?

Mark the correct statement.

Interferons were first discovered from cells infected with which of the following?

Which antibody,if present at birth,indicates that the fetus has been infected (intrauterine infection)?

Identify the correct statements from the following:
$(i)$ The skin is the main physical barrier.
$(ii)$ Mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts is a physiological barrier.
$(iii)$ $IgA, IgM, IgE, IgG$ are types of $T$-cells.
$(iv)$ The primary immune response is very intense.