Immunity that develops in foetus after receiving antibodies from mother's blood through placenta is

Options

A. Naturally acquired active immunity
B. Artificially acquired active immunity
C. Naturally acquired passive immunity
D. Artificially acquired passive immunity

Answer

To answer the question regarding the type of immunity that develops in a fetus after receiving antibodies from the mother's blood through the placenta, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Immunity Types**:
- Immunity can be classified into two broad categories: active and passive immunity.
- Active immunity occurs when the body produces its own antibodies in response to an antigen.
- Passive immunity occurs when antibodies are transferred from another source, rather than produced by the individual's own immune system.

2. **Identifying the Source of Antibodies**:
- In this scenario, the antibodies are being transferred from the mother to the fetus through the placenta.
- Since the antibodies are produced in the mother's body and not in the fetus's body, this indicates that the fetus is receiving passive immunity.

3. **Determining the Nature of the Immunity**:
- The term "naturally acquired" refers to immunity that develops through natural processes, such as maternal transfer of antibodies during pregnancy or breastfeeding.
- In contrast, "artificially acquired" immunity is gained through medical interventions, such as vaccinations or antibody injections.

4. **Conclusion**:
- Since the antibodies are naturally produced by the mother due to her exposure to antigens and are then passed to the fetus, the type of immunity being developed in the fetus is classified as "naturally acquired passive immunity."

5. **Final Answer**:
- Therefore, the correct answer to the question is **naturally acquired passive immunity**.