Which of the following pairs is not correctly matched

Options

A. Dengue fever – Arbovirus
B. Plague – Yersinia pestis
C. Syphilis – Trichuris trichiura
D. Sleeping sickness – Trypanosoma gambiense

Explanation

To solve the question "Which of the following pairs is not correctly matched?", we need to analyze each pair of disease and its causative agent.

### Step-by-Step Solution:

1. **Identify the first pair: Dengue fever and its causative agent.**
- Dengue fever is caused by the Dengue virus, which is an arbovirus.
- **Conclusion:** This pair is correctly matched.

2. **Identify the second pair: Plague and its causative agent.**
- Plague is caused by the bacterium Yersinia pestis.
- **Conclusion:** This pair is correctly matched.

3. **Identify the third pair: Sleeping sickness and its causative agent.**
- Sleeping sickness is caused by the protozoan Trypanosoma brucei.
- **Conclusion:** This pair is correctly matched.

4. **Identify the fourth pair: Syphilis and its causative agent.**
- Syphilis is caused by the bacterium Treponema pallidum.
- The option given states that the causative agent is Trichuris, which is incorrect as Trichuris is the causative agent of trichuriasis, not syphilis.
- **Conclusion:** This pair is not correctly matched.

5. **Final Conclusion:**
- The pair that is not correctly matched is the one that states the causative agent of syphilis as Trichuris. The correct causative agent is Treponema pallidum.
- Therefore, the correct answer is option 3.