The product of fermentation is ________.

Options

A. Formic acid
B. Ethanol
C. Methanol
D. Citric acid

Explanation

To answer the question "The product of fermentation is ________," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Fermentation**:
- Fermentation is a biological process that occurs in the absence of oxygen. It is also known as anaerobic respiration.

2. **Identify the Products of Fermentation**:
- During fermentation, various substances can be produced depending on the type of organism and the substrate used. However, a common product of fermentation in many organisms, especially yeast, is ethyl alcohol.

3. **Review the Options Provided**:
- The options given are:
- A) Formic acid
- B) Ethanol
- C) Methanol
- D) Citric acid

4. **Determine the Correct Answer**:
- Among the options, ethanol (B) is the primary product of alcoholic fermentation, which is a well-known process in yeast and some bacteria.

5. **Conclude the Answer**:
- Therefore, the product of fermentation is **ethanol**.

### Final Answer:
The product of fermentation is **ethanol**.