In vinegar production, the first step (Conversion of sugar in to ethanol) is carried out by .

Options

A. Saccharomyces ellispsodians
B. Acetobactor
C. Gluconobacter
D. Rhizopus

Answer

### Step-by-Step Solution:

1. **Understanding Vinegar Production**: Vinegar is produced through a fermentation process, which involves the conversion of sugars into ethanol and then into acetic acid.

2. **Identifying the First Step**: The first step in vinegar production is the conversion of sugar into ethanol. This step is crucial as it lays the foundation for the subsequent conversion of ethanol into acetic acid.

3. **Role of Yeast**: The conversion of sugar into ethanol is primarily carried out by yeast. The specific type of yeast commonly used in this process is from the genus *Saccharomyces*, particularly *Saccharomyces cerevisiae*.

4. **Enzymatic Action**: When yeast is added to the sugar solution, it produces enzymes that facilitate the breakdown of sugars (carbohydrates) into alcohol (ethanol).

5. **Conclusion**: Therefore, the first step in vinegar production, which involves the conversion of sugar into ethanol, is carried out by yeast, specifically *Saccharomyces cerevisiae*.

### Final Answer:
The first step (conversion of sugar into ethanol) in vinegar production is carried out by yeast, specifically *Saccharomyces cerevisiae*.

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