Which of the disease is not transmitted by house flies

Options

A. Typhoid
B. Yellow fever
C. Cholera
D. Dysentery

Explanation

To determine which disease is not transmitted by house flies, we can analyze the diseases listed in the question.

### Step-by-Step Solution:

1. **Identify the Diseases**: The question presents several diseases: typhoid, cholera, dysentery, and yellow fever.

2. **Research Transmission Methods**:
- **Typhoid**: This is a bacterial disease caused by *Salmonella typhi*. It can be transmitted through contaminated food and water, and house flies can act as vectors by carrying the bacteria on their bodies.
- **Cholera**: This is another bacterial disease caused by *Vibrio cholerae*. Similar to typhoid, it is primarily transmitted through contaminated water and food, and house flies can also carry this pathogen.
- **Dysentery**: This term generally refers to inflammation of the intestines, often caused by bacteria such as *Shigella*. Dysentery can also be transmitted through contaminated food and water, and house flies can play a role in its transmission.
- **Yellow Fever**: This is a viral disease caused by the yellow fever virus, which is transmitted primarily by mosquitoes, specifically the *Aedes* species. House flies do not transmit yellow fever.

3. **Conclusion**: Based on the analysis, yellow fever is the disease that is not transmitted by house flies. The correct answer is yellow fever.

### Final Answer:
Yellow fever is not transmitted by house flies.