Chloromycetin antibiotic was extracted from Streptomyces griseus/venzuelae.

Explanation

**Step-by-Step Solution:**

1. **Understanding Antibiotics**: Antibiotics are substances produced by microorganisms that inhibit the growth of or destroy bacteria and other pathogens. The term "antibiotic" literally means "against life," referring to their ability to kill or inhibit the growth of living organisms, particularly harmful bacteria.

2. **Identifying the Source**: Chloromycetin is an antibiotic that is specifically extracted from a type of bacteria known as *Streptomyces*. There are various species of *Streptomyces*, but the one associated with Chloromycetin is *Streptomyces venezuelae*.

3. **Distinguishing Between Species**: It is important to differentiate between *Streptomyces venezuelae* and *Streptomyces griseus*. While both are sources of antibiotics, *Streptomyces griseus* is known for producing streptomycin, another important antibiotic used to treat tuberculosis and other infections.

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