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A noninfectious unnatural and unusual reaction to asubstance or condition is

  • A.Immunity
  • B.Allergy
  • C.Infection
  • D.Toxin

Answer: B

Correct answer: Allergy

An allergy is an exaggerated immune response to something harmless - pollen, a food, a drug. It is not an infection, since no pathogen is involved, and the damage is done by the reaction rather than by the substance itself.

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