Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?

Options

A. Typhoid
B. Cholera
C. Asthma
D. Dysentry

Answer

To determine which of the following options is not a waterborne disease, we can analyze each option one by one:

1. **Typhoid**: This is a bacterial infection caused by *Salmonella typhi*, which is transmitted through contaminated water. Therefore, typhoid is a waterborne disease.

2. **Cholera**: This is an infectious disease caused by the bacterium *Vibrio cholerae*, which is also spread through contaminated water. Thus, cholera is a waterborne disease.

3. **Asthma**: This is a chronic respiratory condition that is triggered by various factors, including allergens, pollution, and respiratory infections. It is not caused by water contamination but rather by airborne irritants. Therefore, asthma is not a waterborne disease.

4. **Dysentery**: This is an intestinal infection that can be caused by bacteria or parasites, and it is transmitted through contaminated water. Hence, dysentery is a waterborne disease.

After analyzing all the options, we conclude that the disease that is not waterborne is **option C: Asthma**.

### Final Answer:
**Option C: Asthma**