Which of the following causes plague ?

Options

A. Salmonella typhimurium
B. Trichinella spiralis
C. Yersinia Pestis
D. Leishmania donovani

Answer

To determine which organism causes plague, we can analyze the provided options step by step.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- Salmonella Typhimurium
- Trichinella Spiralis
- Yersinia pestis
- Leishmania Donavonii

2. **Analyze Each Option**:
- **Salmonella Typhimurium**: This bacterium is known to cause food poisoning. It is not associated with plague. Therefore, this option is incorrect.
- **Trichinella Spiralis**: This organism causes trichinosis, a disease resulting from consuming undercooked meat infected with larvae. It is not related to plague. Thus, this option is also incorrect.
- **Yersinia pestis**: This is the bacterium responsible for causing plague. Plague is a serious bacterial infection that can affect the lungs, lymph nodes, and blood vessels. This option is correct.
- **Leishmania Donavonii**: This organism is responsible for leishmaniasis, a disease transmitted by sandflies. It does not cause plague, making this option incorrect.

3. **Conclusion**: After analyzing all the options, the only correct answer is **Yersinia pestis**, which is the causative agent of plague.

### Final Answer:
The organism that causes plague is **Yersinia pestis**.