A person shows strong unusual hypersensitive reaction when exposed to certain substance present in air.
Mention the drugs which quickly reduce the symptoms of this condition.

Explanation

### Step-by-Step Solution:

1. **Understanding the Condition**: The person is experiencing a hypersensitive reaction when exposed to certain substances in the air. This condition is known as **allergy**. An allergy is an exaggerated immune response to a foreign substance, known as an **allergen**.

2. **Identifying Allergens**: Allergens can be various substances such as:
- Food (e.g., nuts, shellfish)
- Dust
- Pollen
...