How many types of memory cells are there in the immune system?

  • A
    Innumerable
  • B
    Four
  • C
    Two
  • D
    Three

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Assertion: Interferons are a type of antibodies produced by body cells infected by bacteria.
Reason: Interferons stimulate inflammation at the site of injury.

In the figure,the structure of an antibody molecule is shown. Name the parts $A$,$B$,and $C$.

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