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A person shows strong unusual hypersensi...

A person shows strong unusual hypersensitive reaction when exposed to certain substance present in air.
Mention the term used for these substances.

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**Step-by-Step Solution:** 1. **Understanding the Condition**: The question describes a scenario where a person exhibits a strong and unusual hypersensitive reaction upon exposure to certain substances in the air. This indicates an immune response that is exaggerated or inappropriate. 2. **Identifying the Term**: The medical term used to describe a hypersensitive reaction to substances is "allergy." An allergy occurs when the immune system reacts excessively to a harmless substance. 3. **Defining the Substances**: The specific substances that trigger these allergic reactions are known as "allergens." Allergens can be various types of substances, including pollen, dust mites, pet dander, mold spores, and certain chemicals. ...
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