Inflammatory response in allergy is caused by the released of one of the following by mast cells

Options

A. ANtibodies
B. Antigens
C. Histamine
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the inflammatory response in allergies and what substance is released by mast cells that causes this response.

2. **Identifying Key Terms**: The key terms in the question are "inflammatory response," "allergy," and "mast cells." We need to focus on what mast cells release during an allergic reaction.

3. **Role of Mast Cells**: Mast cells are a type of white blood cell that play a crucial role in the immune response, particularly in allergic reactions. They are found in various tissues throughout the body.

4. **Allergen Interaction**: When an allergen (which can also be referred to as an antigen) enters the body, it triggers the immune system. In response, the body produces specific antibodies, particularly Immunoglobulin E (IgE).

5. **Binding of IgE to Mast Cells**: The IgE antibodies bind to the surface of mast cells. This binding is a critical step in the allergic response.

6. **Release of Chemicals**: Upon binding with the allergen, mast cells release various chemicals, including histamine. Histamine is a key player in the inflammatory response.

7. **Effects of Histamine**: The release of histamine leads to the classic signs of inflammation: redness, swelling, and pain. It can also lead to other symptoms associated with allergies, such as itching and increased mucus production.

8. **Conclusion**: Based on the information gathered, the correct answer to the question is that the inflammatory response in allergy is primarily caused by the release of histamine by mast cells.

### Final Answer:
The correct answer is **C) Histamine**.

---