Antibodies present in colostrum which protect the new born from certain diseases is of

Options

A. lgG type
B. lgA type
C. lgD type
D. lgE type

Explanation

**Step-by-Step Solution:**

1. **Understanding Antibodies:** Antibodies are proteins known as immunoglobulins that play a crucial role in the immune response by identifying and neutralizing pathogens such as bacteria and viruses.

2. **Identifying Colostrum:** Colostrum is the first form of milk produced by mammals immediately following the birth of their young. It is a thick, yellowish fluid rich in nutrients and antibodies.

3. **Role of Colostrum:** Colostrum is vital for newborns as it provides essential nutrients and a high concentration of antibodies that help protect them from infections and diseases during their early life.

4. **Types of Antibodies in Colostrum:** The primary antibody found in colostrum is Immunoglobulin A (IgA). IgA plays a significant role in mucosal immunity, protecting the infant's gastrointestinal tract and respiratory system.

5. **Comparison with Other Antibodies:** While Immunoglobulin G (IgG) is the most abundant antibody in the serum (approximately 80%), IgA is the second most abundant, making up about 10-15% of the total antibodies. IgD and IgE constitute a smaller percentage (2-3%).

6. **Conclusion:** Therefore, the antibodies present in colostrum that protect the newborn from certain diseases are primarily Immunoglobulin A (IgA).

**Final Answer:** The antibodies present in colostrum which protect the newborn from certain diseases are of type **IgA**.

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