Which is not a water borne disease ?

Options

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

Answer

To determine which disease is not a water-borne disease, we will analyze each option provided:

1. **Asthma**:
- Asthma is primarily an inflammatory disease of the airways. It is caused by various allergens such as pollen, dust mites, and pet dander. It is not caused by pathogens that can be transmitted through water. Additionally, asthma is classified as a non-communicable disease, meaning it cannot be spread from one person to another. Therefore, asthma is **not a water-borne disease**.

2. **Cholera**:
- Cholera is caused by the bacterium *Vibrio cholerae*. It is known to be transmitted through contaminated water. When a person ingests water that contains the bacteria, they can become infected. Thus, cholera is a **water-borne disease**.

3. **Amoebiasis**:
- Amoebiasis is caused by the protozoan parasite *Entamoeba histolytica*. This disease can also be transmitted through the fecal-oral route, which often involves contaminated water. Hence, amoebiasis is classified as a **water-borne disease**.

4. **Typhoid**:
- Typhoid fever is caused by the bacterium *Salmonella typhi*. Similar to cholera, typhoid can be transmitted through contaminated water sources. Therefore, typhoid is also a **water-borne disease**.

After analyzing all the options, we conclude that the disease that is **not** a water-borne disease is **Asthma**.

### Final Answer:
Asthma is not a water-borne disease.