Immunoglobulin that increases in number during allergy is

IgA

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IgE

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IgG

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IgM

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Solution

The correct option is B IgE
Immunoglobulin E (IgE) is a type of antibody that has been found only in mammals. IgE is synthesised by plasma cells. IgE has an essential role in type I hypersensitivity (allergy) which includes allergic diseases, such as allergic asthma, sinusitis, allergic rhinitis, food allergies, and specific types of chronic urticaria and atopic dermatitis.
So, the correct answer is 'IgE'.

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