Expand BCG :

Explanation

**Step-by-Step Text Solution:**

1. **Identify the acronym BCG**: The first step is to recognize that BCG is an acronym that stands for a specific term related to health and vaccines.

2. **Expand the acronym**: BCG stands for "Bacillus Calmette-Guérin." This is the full name of the vaccine.

3. **Understand what BCG is**: BCG is a vaccine primarily used against tuberculosis (TB). It is derived from a strain of the bacterium Mycobacterium bovis, which is related to the bacteria that cause TB.

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