Penicillin is obtained from

Options

A. Aspergillus fumigatus
B. Penicillium chrysogenum
C. Penicillium griseofulvum
D. Streptomyces griseus

Answer

### Step-by-Step Solution:

1. **Understanding Penicillin**:
- Penicillin is an antibiotic, which means it is a substance that can inhibit the growth of bacteria. It was the first antibiotic to be discovered and is widely used to treat bacterial infections.

2. **Discovery of Penicillin**:
- Penicillin was discovered by Alexander Fleming, a significant milestone in medical history that led to the development of antibiotics.

3. **Identifying the Source of Penicillin**:
- To answer the question, we need to identify which organism produces penicillin. The options provided include various fungi.

4. **Evaluating the Options**:
- **Option 1**: Aspergillus fumigatus - This fungus is known to cause infections, particularly in the respiratory tract, and does not produce penicillin.
- **Option 2**: Penicillium chrysogenum - This fungus is known specifically for producing penicillin. This is the correct answer.
- **Option 3**: Penicillium griseofulvum - While this fungus produces other chemicals, it does not produce penicillin.
- **Option 4**: Streptomyces griseus - This organism is known for producing the antibiotic streptomycin, not penicillin.

5. **Conclusion**:
- After evaluating all the options, the correct answer is **Penicillium chrysogenum**, as it is the organism that produces penicillin.

### Final Answer:
Penicillin is obtained from **Penicillium chrysogenum**.