the antibiotic Terramycin is obtained from

Options

A. Streptomyces griseus
B. Streptomyces rimosus
C. Streptomyces venezuelae
D. clostridium botulinum

Answer

To determine the source of the antibiotic Terramycin, we will analyze the options provided:

1. **Understanding Antibiotics**: Antibiotics are substances that inhibit the growth of bacteria or kill bacteria, thereby preventing infections.

2. **Identifying the Options**:
- **Option A: Streptomyces griseus** - This organism is known for producing the antibiotic streptomycin, not Terramycin.
- **Option B: Streptomyces ramosus** - This is the organism that produces Terramycin.
- **Option C: Streptomyces venezuelae** - This organism is known for producing chloramphenicol, another antibiotic.
- **Option D: Clostridium botulinum** - This is a pathogenic bacterium that causes botulism and does not produce any antibiotics.

3. **Conclusion**: Based on the analysis of each option, the correct answer is **Streptomyces ramosus**, as it is the source of the antibiotic Terramycin.

### Final Answer:
The antibiotic Terramycin is obtained from **Streptomyces ramosus**.