What are antibiotics? Who discovered Penicillin?

Explanation

### Step-by-Step Solution:

1. **Definition of Antibiotics**:
- Antibiotics are medicines that are used to fight infections caused by bacteria. They work by killing bacteria or inhibiting their growth, thereby helping the body to recover from infections.

2. **Discovery of Penicillin**:
- Penicillin, the first antibiotic, was discovered by Alexander Fleming in 1928. This discovery took place at St. Mary's Hospital in London.

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