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An allergy is a reaction due to sensitivity to what?

  1. Certain exercises

  2. Loud sounds

  3. Specific foods, chemicals, or substances

  4. Bright lights

The correct answer is: Specific foods, chemicals, or substances

An allergy is a response by the immune system to a specific trigger or allergen. While certain exercises, loud sounds, and bright lights may cause a reaction in some people, they are not considered traditional allergens. Allergies are most commonly caused by specific foods, chemicals, or substances that the body has a sensitivity to, causing a variety of symptoms such as sneezing, itching, and swelling. This is why C is the correct answer.