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 follow these steps:

### Step-by-Step Solution:

1. **Understand Hypersensitivity**: Hypersensitivity refers to an exaggerated immune response to a substance that is typically harmless, such as peanuts. This condition is often associated with allergic reactions.

2. **Identify Types of Antibodies**: There are five main classes of antibodies (immunoglobulins) in the human body:
- **IgG**: The most abundant antibody, involved in secondary immune responses and can cross the placenta.
- **IgM**: The first antibody produced in response to an infection, primarily involved in primary immune responses.
- **IgA**: Found in mucosal areas and secretions like saliva and tears; protects mucosal surfaces.
- **IgD**: Functions mainly as a receptor on B cells and is involved in the activation of B cells.
- **IgE**: Specifically associated with allergic reactions and responses to parasitic infections.

3. **Link Hypersensitivity to Antibody Type**: In cases of allergies, such as a peanut allergy, the immune system produces IgE antibodies. These antibodies bind to allergens (in this case, peanut proteins) and trigger allergic reactions.

4. **Conclusion**: Therefore, in a person who is hypersensitive to peanuts, the type of antibody produced is **IgE**.

### Final Answer:
The antibody produced in a person who is hypersensitive to peanuts is **IgE**.

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