The process of fermentation can be both helpful as well as harmful. Justify the statement using an example.

Explanation

### Step-by-Step Solution:

1. **Introduction to Fermentation**:
- Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol using microorganisms such as bacteria and yeast. It is a crucial process in various food production methods.

2. **Helpful Aspects of Fermentation**:
- Fermentation is beneficial in the food industry. For example, it is used to make curd from milk. During this process, beneficial bacteria convert lactose (milk sugar) into lactic acid, which helps in preserving the milk and gives curd its unique taste and texture.

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