Which of the following diseases is caused by a protozona?

Options

A. Babesiosis
B. Blastomycosis
C. Syphills
D. Influenza

Answer

To determine which of the diseases listed is caused by a protozoan, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Diseases**: The question presents several diseases. We need to identify each one to determine if it is caused by a protozoan.

2. **Analyze Each Disease**:
- **Babesiosis**: This is a disease caused by protozoan parasites, specifically from the genus Babesia. It is transmitted through tick bites and affects red blood cells.
- **Blastomycosis**: This is a fungal infection caused by the fungus Blastomyces dermatitidis. It is not caused by a protozoan.
- **Syphilis**: This is a sexually transmitted infection caused by the bacterium Treponema pallidum. It is not a protozoan disease.
- **Influenza**: This is a viral infection caused by the influenza virus. It is not caused by a protozoan.

3. **Conclusion**: After analyzing all the options, we find that only **Babesiosis** is caused by a protozoan. Therefore, the answer to the question is **Babesiosis**.

### Final Answer:
The disease caused by a protozoan is **Babesiosis**.