The yellowish fluid "colostrum" secreted by mammary glands of mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. This type of immunity is called as :

Options

A. Passive immunity
B. Active immunity
C. Acquired immunity
D. Autoimmunity

Answer

To solve the question regarding the type of immunity provided by colostrum, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Colostrum**:
- Colostrum is the yellowish fluid secreted by the mammary glands during the initial days of lactation. It is rich in nutrients and antibodies.

2. **Identifying the Antibodies**:
- The primary antibody found in colostrum is Immunoglobulin A (IgA). This antibody plays a crucial role in mucosal immunity, protecting the infant from infections.

3. **Defining Types of Immunity**:
- **Passive Immunity**: This is immunity acquired through the transfer of antibodies from one individual to another. It does not require the body to produce its own antibodies.
- **Active Immunity**: This involves the body producing its own antibodies in response to an antigen. This process takes time to develop but provides long-lasting protection.
- **Acquired Immunity**: This is a broader term that refers to immunity gained through exposure to antigens and the subsequent development of immune memory.
- **Autoimmunity**: This refers to the immune system mistakenly attacking the body’s own healthy cells.

4. **Analyzing the Options**:
- The question asks for the type of immunity provided by the antibodies in colostrum.
- Since colostrum contains ready-made antibodies (IgA) transferred from the mother to the infant, this is classified as passive immunity.

5. **Conclusion**:
- Therefore, the correct answer to the question is **Passive Immunity**.

### Final Answer:
The type of immunity provided by the yellowish fluid "colostrum" secreted by mammary glands during the initial days of lactation is called **Passive Immunity**.

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