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A patch test resulting in redness or inflammation indicates the presence of a/an?

  1. Infection

  2. Allergy

  3. Irritation

  4. Fungus

The correct answer is: Allergy

Explanation If a patch test results in redness or inflammation, it indicates that the person is having an allergic reaction to the substance that was tested. This means that their body is producing an immune response to the substance, often resulting in inflammation or irritation. Options A, C, and D are incorrect because they do not involve an immune response. An infection typically involves the presence of harmful bacteria or viruses, irritation may be caused by mechanical factors or harsh chemicals, and fungus is a type of infection that can lead to redness or inflammation in some cases. However, only an allergic reaction to the tested substance would result in a positive patch test showing redness or inflammation.