Which of the following is example of the natural passive immunity?

Options

A. inoculated antigen administration
B. polio vaccine drops
C. antitoxin serum
D. colostrum

Answer

**Step-by-Step Text Solution:**

1. **Understanding Passive Immunity**: Passive immunity is a type of immunity that occurs when a person is given antibodies rather than producing them through their own immune system. This can happen naturally or artificially.

2. **Natural Passive Immunity**: Natural passive immunity occurs when antibodies are transferred from one individual to another naturally. This typically happens from mother to child during pregnancy or breastfeeding.

3. **Colostrum**: Colostrum is the first form of milk produced by mammals immediately following the delivery of the newborn. It is rich in antibodies, particularly Immunoglobulin A (IgA), which is crucial for providing immunity to the newborn.

4. **Role of IgA**: IgA is an important antibody found in colostrum that helps protect the newborn from infections by providing immediate immunity.

5. **Conclusion**: Therefore, the example of natural passive immunity is colostrum, as it contains antibodies that are transferred from the mother to the baby, providing the baby with immediate protection against pathogens.

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