The predominant antibody in saliva is

Options

A. (a) IgA
B. (b) IgD
C. (c) IgC
D. (d) IgM

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the predominant antibody found in saliva.

2. **List the Options**: The options provided are IgA, IgD, IgC, and IgM.

3. **Understand the Role of Antibodies**: Antibodies are proteins produced by the immune system to help fight off pathogens. Different types of antibodies have different locations and functions in the body.

4. **Analyze Each Option**:
- **IgA**: This antibody is primarily found in mucosal areas, including saliva, tears, and breast milk. It plays a crucial role in mucosal immunity.
- **IgD**: This antibody is mainly found on the surface of B lymphocytes and is involved in the initiation of immune responses. It is not predominantly found in saliva.
- **IgC (IgG)**: This is the most abundant antibody in blood and lymph, not in saliva.
- **IgM**: This antibody is primarily found in blood and lymph and is involved in the initial stages of immune response.

5. **Determine the Correct Answer**: Given that IgA is the principal antibody present in mucosal secretions, including saliva, the correct answer is **IgA**.

6. **Conclusion**: The predominant antibody in saliva is **IgA**.

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