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Question

Allergy involves _____ antibody.

A
IgE
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B
IgG
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C
IgA
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D
IgM
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Solution

The correct option is A IgE
An allergy is a hypersensitivity disorder of the immune system. Allergic reactions occur when a person's immune system reacts to normally harmless substances in the environment.
Allergic reactions are distinctive, because of excessive activation of certain white blood cells, called as mast cells and basophils by a type of antibody, called as immunoglobulin E or IgE.
The underlying mechanism involves immunoglobulin E antibodies (IgE), part of the body's immune system, binding to an allergen and then to a receptor on mast cells or basophils where it triggers the release of inflammatory chemicals such as histamine.
Thus, the correct answer is option (A), 'IgE'.

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