The disease caused by bacteria is

Options

A. Amoebic dysentery
B. Arthritis
C. Beri- beri
D. Diphtheria.

Answer

To answer the question "The disease caused by bacteria is:", we will analyze the provided options one by one.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Amoebic dysentery
- B) Arthritis
- C) Beriberi
- D) Diphtheria

2. **Analyze Option A - Amoebic Dysentery**:
- Amoebic dysentery is caused by a protozoan parasite known as *Entamoeba histolytica*.
- **Conclusion**: This option is not caused by bacteria.

3. **Analyze Option B - Arthritis**:
- Arthritis is a condition characterized by joint inflammation and pain. It can be caused by various factors, including autoimmune diseases and wear and tear, but it is not specifically caused by bacteria.
- **Conclusion**: This option is not caused by bacteria.

4. **Analyze Option C - Beriberi**:
- Beriberi is a disease that results from a deficiency of vitamin B1 (thiamine). It is not caused by any infectious agent, including bacteria.
- **Conclusion**: This option is not caused by bacteria.

5. **Analyze Option D - Diphtheria**:
- Diphtheria is an infectious disease caused by the bacterium *Corynebacterium diphtheriae*. It affects the mucous membranes of the throat and nose and can lead to serious complications.
- **Conclusion**: This option is caused by bacteria.

6. **Final Answer**:
- Based on the analysis, the disease caused by bacteria is **Diphtheria** (Option D).