Inflammation reaction is brought about by

Options

A. mast cells
B. macrophages
C. plasma cells
D. adipose cells

Answer

### Step-by-Step Solution:

1. **Understanding Inflammation**: Inflammation is a biological response to harmful stimuli such as pathogens, damaged cells, or irritants. It is a protective mechanism that involves the immune system.

2. **Identifying the Signs of Inflammation**: The common signs of inflammation include redness, swelling, pain, and increased temperature at the site of infection or injury. These signs indicate that the body is responding to a threat.

3. **Role of Immune Cells**: Various immune cells are involved in the inflammatory response. The key players in this process include mast cells, macrophages, plasma cells, and adipose cells.

4. **Focus on Mast Cells**: Among these cells, mast cells are particularly important in the initiation of the inflammatory response. They are a type of white blood cell (WBC) that contain granules filled with chemicals.

5. **Release of Histamine**: When there is an infection or injury, mast cells become activated and release histamine. Histamine is a chemical that increases blood flow to the affected area, leading to the characteristic signs of inflammation.

6. **Conclusion**: Given the options provided (mast cells, macrophages, plasma cells, adipose cells), the correct answer is mast cells, as they are directly responsible for initiating the inflammatory reaction through the release of histamine.

### Final Answer:
The inflammation reaction is brought about by **mast cells**.

---