Which of the following antibody is related to allergic response?

Options

A. IgA
B. IgE
C. IgM
D. IgG

Answer

To determine which antibody is related to allergic responses, we can analyze the different types of antibodies mentioned in the question:

1. **Identify the antibodies**: The question presents four types of antibodies: IgA, IgE, IgM, and IgG.

2. **Understand the function of each antibody**:
- **IgA**: This antibody is primarily found in mucous membranes and plays a crucial role in mucosal immunity. It helps protect against pathogens at mucosal surfaces but is not directly involved in allergic responses.
- **IgE**: This antibody is specifically associated with allergic reactions. It binds to allergens and triggers the release of inflammatory mediators like histamines from mast cells and basophils, leading to allergic symptoms.
- **IgM**: This antibody is involved in the initial immune response and is important for the activation of B cells. It is not primarily associated with allergic responses.
- **IgG**: This is the most abundant antibody in circulation and plays a key role in the immune response, but it is not specifically linked to allergic reactions.

3. **Conclude the answer**: Based on the functions of these antibodies, the one that is directly related to allergic responses is **IgE**.

Thus, the correct answer to the question is **IgE**.