The type of immunoglobulin present in the foetus are

Options

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

Explanation

To determine the type of immunoglobulin present in the fetus, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Immunoglobulins**:
- Immunoglobulins (Ig) are antibodies produced by B cells and play a crucial role in the adaptive immune response. There are five main classes of immunoglobulins: IgA, IgD, IgE, IgG, and IgM.

2. **Evaluating Immunoglobulin D (IgD)**:
- IgD is primarily involved in the activation of B cells during the immune response. It is not typically found in significant amounts in the fetus.
- **Conclusion**: IgD is not the immunoglobulin present in the fetus.

3. **Evaluating Immunoglobulin E (IgE)**:
- IgE is associated with allergic reactions and is secreted by mast cells and basophils. It plays a role in responses to allergens but does not cross the placenta.
- **Conclusion**: IgE is not the immunoglobulin present in the fetus.

4. **Evaluating Immunoglobulin G (IgG)**:
- IgG is the only immunoglobulin that can cross the placenta due to its small size. It provides passive immunity to the fetus, protecting it from infections during the early stages of life.
- **Conclusion**: IgG is present in the fetus.

5. **Evaluating Immunoglobulin M (IgM)**:
- IgM is the first antibody produced in response to an infection. It is a pentameric immunoglobulin but does not cross the placenta.
- **Conclusion**: IgM is not the immunoglobulin present in the fetus.

### Final Answer:
The type of immunoglobulin present in the fetus is **Immunoglobulin G (IgG)**.

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