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A substance in the blood that tends to neutralise harmful matter.

  • A.Antidote
  • B.Antibiotic
  • C.Antiseptic
  • D.Antibody

Answer: D

It is an antibody.

An antibody is a protein made by the immune system to neutralise a specific foreign substance. An antidote counters a poison, an antiseptic prevents infection on a surface, and an antibiotic kills bacteria.

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