Penicillin was the first antibiotic made by Alexander Fleming from

Options

A. Penicillium chrysogenum
B. Penicillium notatum
C. Streptococcus thermophilus
D. Penicillium roqueforti

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the source of the first antibiotic discovered by Alexander Fleming, which is penicillin.

2. **Identifying the Options**: The options provided are:
- A) Panicillium chrysogenum
- B) Panicillium notatum
- C) Streptococcus thermophilus
- D) Panicillium rococorti

3. **Recalling Historical Context**: Alexander Fleming discovered penicillin in 1928. He observed that a mold (fungus) had antibacterial properties.

4. **Identifying the Correct Fungus**: The specific mold that Fleming discovered was from the genus Penicillium. The correct species that produced penicillin is Penicillium notatum.

5. **Eliminating Incorrect Options**:
- Panicillium chrysogenum is often confused with Penicillium notatum, but it is not the one Fleming originally worked with.
- Streptococcus thermophilus is a bacterium, not a fungus.
- Panicillium rococorti is not related to the discovery of penicillin.

6. **Final Answer**: Based on the above reasoning, the correct answer is **B) Penicillium notatum**.

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