A person shows strong unusual hypersensitive reactions when exposed to certain substances present in the air. Indentify the condition. Name the cells respondible for such reactions. What precaution should be taken to avoid such reactions.

Explanation

If a person is hypersensitive to certain substance present in the air, he may be allergic to it. Mast cells release certain chemicals, e.g., histamine and serotonin, in response to this substance, that result in allergic reaction.
Precaution taken to prevent such reaction is to avoid the allergens responsible for particular allergy.