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  1. Hypersensitivity to an allergen is associated with
    1. aberrant functioning of the immune mechanism
    2. increase in ambient temperature
    3. age of the individual
    4. food habits
Correct Option: A

Allergy means all kinds of untoward reactions manifested in the body due to hypersensitivity of substances called allergens. Allergy reactions occur due to liberation of histamine by tissue cells.


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