Tuberculosis, typhoid and cholera caused by :

Options

A. Algae
B. Virus
C. Bacteria
D. None of these

Explanation

### Step-by-Step Solution:

1. **Identify the Diseases**: The question asks about three diseases: tuberculosis, typhoid, and cholera.

2. **Determine the Causative Agents**:
- **Tuberculosis**: This disease is caused by a bacterium known as *Mycobacterium tuberculosis*.
- **Typhoid**: This disease is caused by a bacterium called *Salmonella typhi*.
- **Cholera**: This disease is caused by a bacterium known as *Vibrio cholerae*.

3. **Analyze the Options**: The options provided are:
- Algae
- Virus
- Bacteria
- None of these

4. **Conclusion**: Since all three diseases (tuberculosis, typhoid, and cholera) are caused by bacteria, the correct answer is **C, Bacteria**.