Which is an incorrect pair based on its role in the immune system?

  • A
    Interferons - Secreted by virus-infected cells which protect non-infected cells from further viral infection.
  • B
    $B$-cells - Produce an army of antibodies against pathogens.
  • C
    Macrophages - Mucous secreting cells which destroy pathogens.
  • D
    $IgA$ - Present in initial days of lactation to protect the infant.

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