How many of the following diseases are transmitted by contaminated food and water?
[Typhoid, Ringworms, Pneumonia, Common cold, Dengue, Amoebiasis, Chikungunya]

Options

A. One
B. Two
C. Three
D. Four

Answer

To determine how many of the listed diseases are transmitted by contaminated food and water, we will analyze each disease one by one.

1. **Typhoid**:
- Typhoid is caused by the bacterium *Salmonella typhi*. It is well-known to be transmitted through contaminated food and water.
- **Conclusion**: Typhoid is transmitted by contaminated food and water.

2. **Ringworm**:
- Ringworm is a fungal infection caused by fungi of the genus *Microsporum*. It is primarily spread through direct contact with infected skin or surfaces, not through food or water.
- **Conclusion**: Ringworm is NOT transmitted by contaminated food and water.

3. **Pneumonia**:
- Pneumonia can be caused by bacteria, viruses, or fungi and is primarily spread through respiratory droplets when an infected person coughs or sneezes. It is not transmitted through food or water.
- **Conclusion**: Pneumonia is NOT transmitted by contaminated food and water.

4. **Common Cold**:
- The common cold is caused by various viruses, mainly rhinoviruses, and is spread through airborne droplets or by touching contaminated surfaces. It is not associated with food or water transmission.
- **Conclusion**: Common cold is NOT transmitted by contaminated food and water.

5. **Dengue**:
- Dengue is a viral disease transmitted by mosquitoes, specifically the *Aedes aegypti* mosquito. It is not transmitted through food or water.
- **Conclusion**: Dengue is NOT transmitted by contaminated food and water.

6. **Amoebiasis**:
- Amoebiasis is caused by the parasite *Entamoeba histolytica* and is transmitted through contaminated food and water, often via houseflies that carry the cysts.
- **Conclusion**: Amoebiasis is transmitted by contaminated food and water.

7. **Chikungunya**:
- Chikungunya is also a viral disease transmitted by mosquitoes, particularly the *Aedes* species. It is not transmitted through food or water.
- **Conclusion**: Chikungunya is NOT transmitted by contaminated food and water.

**Final Count**:
From the analysis, we find that only **two diseases** (Typhoid and Amoebiasis) are transmitted by contaminated food and water.

### Final Answer: 2