Match the columns:
| Commercial antibiotics | Producing microorganisms |
| P. Chloramphenicol | 1. Micromonospora purpurea |
| Q. Streptomycin | 2. Streptomyces aureofaciens |
| R. Tetracycline | 3. Streptomyces griseus |
| S. Gentamicin | 4. Streptomyces venezuelae |
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