What is the reason of large holes in Swiss cheese? Name the fungus used in ripening of Roquefort cheese.

Explanation

### Step-by-Step Solution:

1. **Understanding Swiss Cheese Formation**:
- Swiss cheese is characterized by its large holes, also known as "eyes." These holes are formed during the cheese-making process.

2. **Role of Bacteria**:
- The primary reason for the formation of these holes is the production of carbon dioxide (CO2) gas. This gas is produced by specific bacteria during the fermentation process.

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