Which is incorrect pair on basis of its role in immune system?

• A

  Interferons- secreted by virus infected cell which protect non-infected cells from further viral infection.

• B

  $B$ -cell - produce on army of antibodies against pathways.

• C

  Marcophases- mucous secreting cells which destroy pathogens.

• D

  $IgA$ - present in initial days of lactation to protect the infant.