It was found that water from a river was contaminated with Coliform bacteria. Which one of the following pollutant might have got mixed with the water?

Options

A. Fertilizer run off
B. Industrial waste
C. Pesticides
D. Human faecal matter.

Explanation

To determine which pollutant might have mixed with the river water contaminated with Coliform bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Contaminant**: The question states that the river water is contaminated with Coliform bacteria. Coliform bacteria are commonly found in the intestines of humans and warm-blooded animals.

2. **Understand the Source of Coliform Bacteria**: Since Coliform bacteria are indicative of fecal contamination, their presence in water suggests that the water has been contaminated with substances that contain fecal matter.

3. **Evaluate the Options**: We have four options to consider:
- **Fertilizer runoff**: This typically contains nutrients like nitrogen and phosphorus but does not contain Coliform bacteria.
- **Industrial Waste**: While this can contain various harmful substances, it is not a common source of Coliform bacteria.
- **Pesticides**: These are chemicals used in agriculture and do not typically contain bacteria.
- **Human Fecal Matter**: This is a direct source of Coliform bacteria as it contains the bacteria from the intestines.

4. **Conclusion**: Given the understanding that Coliform bacteria indicate fecal contamination, the most likely pollutant that could have mixed with the river water is **Human Fecal Matter**.

### Final Answer:
**D. Human Fecal Matter**

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