`C_2H_5OH` is commercially produced through a particular species of

Options

A. Saccharomyces
B. Clostridium
C. Trichoderma
D. Aspergillus

Answer

To determine which organism is responsible for the commercial production of ethanol (C2H5OH), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compound**: The compound in question is C2H5OH, which is known as ethanol or ethyl alcohol.

2. **Understand the Context**: Ethanol is commonly produced through fermentation, a process where sugars are converted into alcohol and carbon dioxide by microorganisms.

3. **Review the Options**: The options provided are:
- A. Saccharomyces
- B. Clostridium
- C. Trichoderma
- D. Aspergillus

4. **Evaluate Each Option**:
- **A. Saccharomyces**: This is a genus of yeast, specifically Saccharomyces cerevisiae, which is widely used in the fermentation process to produce ethanol from sugars.
- **B. Clostridium**: This genus includes bacteria that can ferment sugars but is more associated with producing butanol and other products rather than ethanol.
- **C. Trichoderma**: This is a genus of fungi primarily known for its role in decomposing plant material and is not used for ethanol production.
- **D. Aspergillus**: This genus includes fungi that are used in various fermentation processes but not specifically for ethanol production.

5. **Conclusion**: Based on the evaluation, the organism that is commercially used for the production of ethanol is **Saccharomyces**.

### Final Answer:
The correct answer is **A. Saccharomyces**.

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