Allergy is defined as ..........

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(A) Allergy is the exaggerated response of the immune system to certain antigens present in the environment. These antigens are called allergens. Comm

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Exaggerated response of the immune system to certain antigens.

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(A) Allergy is the exaggerated response of the immune system to certain antigens present in the environment. These antigens are called allergens. Common examples of allergens include mites in dust,pollens,and animal dander. The antibodies produced in response to these allergens are of the $IgE$ type. Symptoms of allergic reactions include sneezing,watery eyes,running nose,and difficulty in breathing.

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