Which of the the following microbe is the source of first antibiotic ?

Options

A. Penicillium
B. Staphylococci
C. Aspergillus niger
D. Bacillus brevis

Explanation

To answer the question "Which of the following microbe is the source of the first antibiotic?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Antibiotics**:
- Antibiotics are substances produced by microbes that can kill or inhibit the growth of other microbes, particularly those that cause diseases.

2. **Identifying the Options**:
- The options given are:
- A) Penicillium
- B) Staphylococci
- C) Aspergillus niger
- D) Bacillus brevis

3. **Researching the First Antibiotic**:
- The first antibiotic discovered was penicillin, which is derived from the mold Penicillium notatum.

4. **Matching the Microbe to the Antibiotic**:
- Among the options, Penicillium is the only one that is known to produce penicillin, the first antibiotic.

5. **Conclusion**:
- Therefore, the correct answer to the question is **A) Penicillium**.

### Final Answer:
The source of the first antibiotic is **Penicillium**.

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