Choose the true statements

$I.$ Innate immunity is accomplished by providing different types of barriers

$II.$ Acquired immunity is present from the birth and is inherited from parents

$III.$ Sweat, tears, acid in the stomach and saliva prevent microbial growth

Assertion : Interferons are a type of'antibodies produced by body cells infected by bacteria.

Reason : Interferons stimulate inflammation at the site of injury.

Immune activities defence mechanism for different diseases is known as

Given below the diagrammatic representation of lymph nodes

Label $A, B$ and $C$

Which of the following immunoglobulins does constitute the largest percentage in human milk ?

Spleen is