What is the role of histamine in inflammatory response ? Name few drugs which reduce symptoms of allergy?

Explanation

### Step-by-Step Solution:

1. **Understanding Histamine**:
- Histamine is a chemical compound that plays a crucial role in the body’s immune response. It is primarily known as an allergy mediator.

2. **Role of Histamine in Inflammatory Response**:
- Histamine is released by mast cells during an allergic reaction or inflammatory response.
- Once released, histamine causes the dilation of blood vessels (vasodilation). This process increases blood flow to the affected area, leading to redness and swelling, which are characteristic signs of inflammation.
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