Fleming discovered Penicillin from

Options

A. Penicillium notatum
B. P. roqueforti
C. P. camenberti
D. P. chrysogenum.

Answer

**Step-by-Step Solution:**

1. **Identify the Scientist**: The question asks about the discovery of penicillin, which is attributed to Alexander Fleming.

2. **Context of Discovery**: Fleming was working with bacteria, specifically Staphylococci, when he made his discovery.

3. **Observation of Mold**: While conducting his experiments, Fleming noticed that a mold had formed on an unwashed culture of Staphylococci.

4. **Identification of the Mold**: Upon further investigation, Fleming identified the mold as belonging to a fungus known as Penicillium notatum.

5. **Chemical Production**: Fleming discovered that Penicillium notatum secretes a chemical that inhibits the growth of Staphylococci bacteria.

6. **Naming the Chemical**: He named this chemical "penicillin," which became the first widely used antibiotic.

7. **Recognition of the Discovery**: Although Fleming discovered penicillin, its full potential as an antibiotic was later established by Ernst Chain and Howard Florey, who also contributed to its development for medical use.

8. **Nobel Prize Award**: Fleming, along with Chain and Florey, was awarded the Nobel Prize in 1945 for their contributions to the discovery and development of penicillin.

9. **Final Answer**: Therefore, the answer to the question "Fleming discovered penicillin from" is **Penicillium notatum**.

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