________is a fatal disease which reduces the immunity of the body.

Options

A. TB
B. Typhoid
C. Syphilis
D. Acquired Immuno deficiency Syndrome

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a fatal disease that reduces the immunity of the body. This means we are looking for a disease that significantly weakens the immune system and can lead to death.

2. **Analyzing the Options**: The options provided are:
- TB (Tuberculosis)
- Typhoid
- Syphilis
- Acquired Immunodeficiency Syndrome (AIDS)

3. **Evaluating Each Option**:
- **TB (Tuberculosis)**: While TB is a serious infectious disease, it primarily affects the lungs and does not directly reduce the overall immunity of the body.
- **Typhoid**: This is a bacterial infection that can be serious, but it does not specifically target the immune system.
- **Syphilis**: This is a sexually transmitted infection that can have severe health consequences if untreated, but it does not primarily reduce immunity.
- **AIDS (Acquired Immunodeficiency Syndrome)**: This is a viral infection caused by the Human Immunodeficiency Virus (HIV). It specifically attacks and destroys white blood cells (CD4 cells), which are crucial for a healthy immune response.

4. **Conclusion**: Based on the evaluation, the only disease that is fatal and significantly reduces the body's immunity is AIDS.

5. **Final Answer**: The answer to the question is **Acquired Immunodeficiency Syndrome (AIDS)**.

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