When basophils are encountered with allergin they release histamine which causes increased blood flow to damaged tissues, resulting in swelling and inflammation. Hence, blood cells involved in inflammatory reactions are 'Basophils'.

Inflammatory reactions are essential defense mechanisms of the immune system that occur in response to tissue injury or infection. These reactions involve a complex interplay between various cells and molecules of the immune system. While multiple types of cells are involved in inflammatory reactions, the correct answer to this question is option 'A' - Basophils.

Basophils are a type of white blood cell that plays a significant role in the immune response, particularly in allergic reactions and inflammation. Here is a detailed explanation of why basophils are involved in inflammatory reactions:

1. Function of Basophils:
- Basophils are primarily responsible for releasing chemical mediators, such as histamine and heparin, during an immune response.
- Histamine is a potent vasodilator that increases blood flow to the affected area, leading to redness and warmth, which are characteristic signs of inflammation.
- Heparin is an anticoagulant that prevents blood clotting, allowing immune cells to move more freely to the site of inflammation.

2. Recruitment to the Site of Inflammation:
- When tissue damage or infection occurs, local immune cells release chemical signals called cytokines.
- These cytokines attract basophils to the site of inflammation, where they can contribute to the immune response.

3. Interaction with Other Immune Cells:
- Basophils interact with other cells of the immune system, such as neutrophils and eosinophils.
- Neutrophils are the most abundant type of white blood cell and are also involved in inflammatory reactions. They are responsible for phagocytosing and destroying pathogens.
- Eosinophils are involved in allergic reactions and combat parasitic infections.
- Basophils can release chemical signals that attract and activate neutrophils and eosinophils, amplifying the immune response at the site of inflammation.

4. Allergic Reactions:
- Basophils are particularly important in allergic reactions, such as asthma or hives.
- In response to an allergen, basophils release large amounts of histamine, leading to the characteristic symptoms of an allergic reaction, such as itching, swelling, and bronchoconstriction.

In conclusion, basophils are involved in inflammatory reactions due to their ability to release chemical mediators, recruit other immune cells, and contribute to the immune response. While neutrophils, eosinophils, and lymphocytes also play roles in inflammation, basophils are specifically known for their involvement in allergic reactions and inflammation.