Excessive and inappropriate immune response to an antigen is

Anaphylaxis

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Multiple Sclerosis

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Allergy

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Immune deficiency

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Solution

The correct option is B Allergy
Allergies, also known as allergic diseases are a number of conditions caused by hypersensitivity (excessive) of the immune system to typically harmless substances in the environment. Symptoms may include red eyes, an itchy rash, sneezing, a runny nose, shortness of breath. Food, insect stings, and medications are common causes of severe reactions.
So, the correct answer is 'Allergy'.

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