Which of the following antibody present in colostrum and provide passive immunity to the infant ?

Options

A. lgM,lgG
B. lgG,lgA
C. lgA only
D. lgG only

Answer

To solve the question "Which of the following antibody present in colostrum and provides passive immunity to the infant?", we will analyze the options provided and identify the correct antibody.

### Step-by-Step Solution:

1. **Understanding Colostrum**:
- Colostrum is the first form of milk produced by mammals immediately following delivery. It is rich in antibodies and provides essential nutrients to the newborn.

2. **Identifying Antibodies**:
- The main antibodies we need to consider are IgM, IgG, and IgA.

3. **Analyzing Each Option**:
- **Option 1: IgM and IgG**:
- IgM is primarily found in blood and lymph and is the first antibody produced in response to an infection. IgG is the most abundant antibody in blood but is not the primary antibody in colostrum.
- **Conclusion**: This option is incorrect.

- **Option 2: IgG and IgA**:
- IgG, while important for immune response, is not the primary antibody in colostrum. IgA is present in mucosal areas and is found in colostrum.
- **Conclusion**: This option is incorrect.

- **Option 3: IgA only**:
- IgA is the main antibody found in colostrum and plays a crucial role in providing passive immunity to infants by protecting them against infections.
- **Conclusion**: This option is correct.

- **Option 4: IgG only**:
- IgG is not the primary antibody in colostrum. While it has important functions in the immune system, it is not the antibody that provides passive immunity in this context.
- **Conclusion**: This option is incorrect.

4. **Final Answer**:
- The correct answer is **Option 3: IgA only**.