Which of the following is not a water -borne disease ?

Options

A. cholera
B. tuberculosis
C. typhoid
D. dysentery

Answer

To determine which of the following is not a water-borne disease, we need to analyze each option provided. Here’s a step-by-step solution:

### Step 1: Understand Water-borne Diseases
Water-borne diseases are illnesses caused by pathogens that are transmitted through contaminated water. Common examples include cholera, typhoid, and dysentery.

### Step 2: Analyze Each Option
1. **Cholera**: This is caused by the bacterium *Vibrio cholerae*. It is a well-known water-borne disease.
2. **Tuberculosis (TB)**: This is caused by the bacterium *Mycobacterium tuberculosis*. TB is primarily transmitted through the air when an infected person coughs or sneezes, not through water. Therefore, it is NOT a water-borne disease.
3. **Typhoid**: This is caused by the bacterium *Salmonella typhi*. It is also classified as a water-borne disease.
4. **Dysentery**: This can be caused by bacteria or parasites and is also transmitted through contaminated water, making it a water-borne disease.

### Step 3: Conclusion
Based on the analysis, the disease that is NOT a water-borne disease is **Tuberculosis**.

### Final Answer
**Tuberculosis** is not a water-borne disease.

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