Immunoglobulin present in sebum is

Options

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

Answer

To determine the immunoglobulin present in sebum, we can analyze the options provided:

1. **Understanding the Types of Immunoglobulins:**
- **IgG:** This is the most abundant immunoglobulin found in all body fluids. It plays a crucial role in the immune response against bacterial and viral infections. However, it is not specifically associated with sebum.
- **IgM:** This immunoglobulin is primarily found in the blood and lymphatic fluid. It is the first antibody produced in response to an infection but is not present in sebum.
- **IgA:** This immunoglobulin is found in various secretions, including tears, sweat, and importantly, sebum. It plays a role in mucosal immunity and helps protect body surfaces exposed to pathogens.
- **IgE:** This immunoglobulin is mainly associated with allergic reactions and is found in the lungs and skin, but it is not present in sebum.

2. **Identifying the Correct Answer:**
- Given the analysis of each immunoglobulin, **IgA** is the only one that is specifically found in sebum.

Thus, the immunoglobulin present in sebum is **IgA**.