Question

Define allergy?

Answer 1

1. Allergies are reactions that are brought about when the immune system reacts to foreign substances in the environment.
2. Allergy is an overreaction of the body's immune system to certain substances in amounts that are otherwise harmless and do not affect most people.
3. It is also known as hypersensitivity.
4. The substance that triggers an allergic reaction are called allergens, these include dust, pollens, perfumes, etc.