The first antibiotic Penicillin was discovered by:

Options

A. Louis Pasteur
B. Robert Koch
C. Alexander Fleming
D. Edward Jenner

Explanation

**Step-by-Step Solution:**

1. **Understanding Antibiotics**: Begin by defining what antibiotics are. Antibiotics are chemical substances that are used to kill or inhibit the growth of bacteria. They are derived from microorganisms.

2. **Identifying Penicillin**: Recognize that Penicillin is the first antibiotic discovered. It plays a crucial role in treating bacterial infections.

3. **Discoverer of Penicillin**: Identify the scientist who discovered Penicillin. The antibiotic was discovered by Alexander Fleming in the year 1928.

4. **Recognition of Contribution**: Acknowledge that Alexander Fleming's discovery of Penicillin was significant enough to earn him a Nobel Prize.

5. **Conclusion**: Based on the information gathered, conclude that the correct answer to the question is Alexander Fleming.

**Final Answer**: The first antibiotic Penicillin was discovered by Alexander Fleming.

---