Curdling of milk is done by ..................

Explanation

**Step-by-Step Solution:**

1. **Identify the Process**: The question asks about the curdling of milk, which is a fermentation process that transforms liquid milk into solid curd.

2. **Determine the Microbe Involved**: The key microbe responsible for the curdling of milk is Lactic Acid Bacteria (LAB).

3. **Understand the Role of LAB**: Lactic Acid Bacteria grow in milk under suitable conditions. They multiply and produce lactic acid.

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