Who discovered first antibiotic ?

Explanation

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

1. **Understanding the Question**: The question asks about the discovery of the first antibiotic. Antibiotics are substances that can kill or inhibit the growth of bacteria.

2. **Identifying Key Figures in Antibiotic Discovery**: The most notable figure in the discovery of the first antibiotic is Alexander Fleming.

3. **Researching Alexander Fleming**: Alexander Fleming was a Scottish physician and bacteriologist. His work in the early 20th century led to significant advancements in medicine.

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