Expand the term LAB.

Explanation

**Step-by-Step Solution:**

1. **Identify the Acronym**: The term L.A.B. needs to be expanded. We start by identifying what each letter represents.

2. **Expand the Acronym**: The letters in L.A.B. stand for "Lactic Acid Bacteria."

3. **Contextual Information**: Lactic Acid Bacteria (LAB) are microorganisms that are commonly found in milk and are crucial for the fermentation process.

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