Which of the following types of antibodies are produced in a person who is hypersensitive to peanuts ?

Options

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

Answer

To determine which type of antibodies are produced in a person who is hypersensitive to peanuts, we can analyze the options provided:

1. **Understanding the Types of Antibodies**:
- **Immunoglobulin A (IgA)**: This antibody is primarily found in secretions such as tears, saliva, and breast milk. It plays a role in mucosal immunity but is not directly involved in allergic reactions.
- **Immunoglobulin E (IgE)**: This antibody is specifically associated with allergic reactions. It binds to allergens (like peanuts) and triggers the release of histamines and other chemicals from mast cells and basophils, leading to hypersensitivity reactions.
- **Immunoglobulin D (IgD)**: This antibody is primarily found on the surface of B cells and is involved in the initiation of immune responses. It does not play a significant role in allergic reactions.
- **Immunoglobulin M (IgM)**: This is the first antibody produced in response to an infection. It is involved in the primary immune response but is not specifically related to allergies.

2. **Identifying the Correct Antibody**:
- Since the question asks for the antibody type produced in response to hypersensitivity to peanuts, we focus on IgE. It is well-known that IgE is the antibody that mediates allergic reactions, including food allergies like those to peanuts.

3. **Conclusion**:
- The correct answer is **Immunoglobulin E (IgE)**, as it is the antibody produced in response to allergens and is responsible for hypersensitivity reactions.

### Step-by-Step Solution:
1. **Analyze the options**: Review the functions of IgA, IgE, IgD, and IgM.
2. **Identify the role of each antibody**: Understand which antibodies are involved in allergic reactions.
3. **Focus on IgE**: Recognize that IgE is specifically associated with allergies and hypersensitivity.
4. **Select the correct answer**: Conclude that the answer is Immunoglobulin E (IgE).