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प्रश्न
Write, in brief, about the following: Allergy
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उत्तर
Allergy is an excessive sensitivity of the human body to some substances which are otherwise harmless. The allergens include dust, pollen grains, spores, furs, etc. Asthma and hay fever are examples of allergies. Rashes, itching, wheezing and sneezing are common symptoms of allergy.
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