Most of the Eubacteriales antibiotics come from

Options

A. Bacillus
B. Rhizobium
C. Pseudomonas
D. Streptococcus

Explanation

**Step-by-Step Solution:**

1. **Understanding Eubacteriales**: Eubacteriales, also known as true bacteria, are a large group of bacteria that are characterized by their simple cellular structure. They are significant in various biological processes, including the production of antibiotics.

2. **Sources of Antibiotics**: Antibiotics are substances that inhibit the growth of or destroy bacteria. They are primarily derived from microorganisms, particularly bacteria and fungi.

3. **Key Bacterial Genera**: Among the various bacteria, certain genera are known for their antibiotic production:
- **Bacillus**: This genus is well-known for producing a variety of antibiotics, including bacitracin and polymyxin.
- **Streptomyces**: A genus of bacteria that is the primary source of many antibiotics, including streptomycin, tetracycline, and erythromycin.
- **Pseudomonas**: This genus also contributes to antibiotic production but to a lesser extent compared to Bacillus and Streptomyces.

4. **Percentage Contribution**: It is noted that approximately 70% of antibiotics are derived from the genus Bacillus and other Eubacteriales, while the remaining 30% comes from other sources like Pseudomonas.

5. **Conclusion**: Based on the information gathered, the correct answer to the question "Most of the Eubacteriales antibiotics come from" is **Bacillus**.

**Final Answer**: Bacillus (Option 1)

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