A non-infectious unnatural and unusual reaction of a person to any substance or condition for which he is hypersensitive is termed as
A
Infection
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B
Immunity
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C
Allergy
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D
Toxin
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Solution
The correct option is C Allergy Allergy is a condition caused by hypersensitivity of the immune system to something in the environment that normally causes the little problem to most people.
These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, runny nose, shortness of breath, or swelling. Food intolerances and food poisoning are separate conditions.
Common allergens include pollen and food. Metals and other substances may also cause problems. Food, insect stings, and medications are common causes of severe reactions.
Thus, the correct answer is option (C), 'Allergy'.