The antibiotic, penicillin is extracted from a mould called______.

Explanation

**Step-by-Step Solution:**

1. **Understanding Antibiotics**: Antibiotics are substances that can kill or inhibit the growth of bacteria. They are used to treat infections caused by bacteria.

2. **Identifying the Discovery**: The antibiotic penicillin was discovered by Alexander Fleming. He was conducting experiments on Staphylococci bacteria.

3. **Observation of Mold**: During his experiments, Fleming noticed a mold growing in one of his unwashed culture plates. This mold was preventing the growth of the bacteria around it.

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