Opsonisation is carried out by

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding Opsonization:** Opsonization is a biological process that enhances the ability of phagocytes (like macrophages and neutrophils) to engulf and destroy pathogens. It involves marking the pathogens for ingestion.

2. **Role of Opsonins:** Opsonins are molecules that bind to the surface of pathogens. They serve as a bridge between the pathogen and the phagocyte, facilitating phagocytosis.

3. **Types of Antibodies:** The question provides several types of antibodies: IgM, IgG, IgA, IgD, and IgE. Each of these antibodies has different functions in the immune response.

4. **Identifying the Correct Antibody:** Among the antibodies listed, IgG is known for its role in opsonization. It binds to pathogens and marks them for destruction by phagocytes.

5. **Conclusion:** Therefore, the correct answer to the question "Opsonization is carried out by" is **IgG**.

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