Which of the following is used as a substrate for the production of `CH_3CH_2OH` ?

Options

A. Maize
B. Malted cereals
C. Lactose
D. None of the above

Answer

To solve the question regarding which substrate is used for the production of ethanol (CH₃CH₂OH), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: We need to identify which of the given options can be used as a substrate for the production of ethanol.

2. **Analyzing the Options**: The options provided are:
- Maize
- Malted cereals
- Lactose
- None of the above

3. **Identifying the Process**: Ethanol production typically involves fermentation, which can utilize various substrates. Common substrates include sugars and starches.

4. **Evaluating Each Option**:
- **Maize**: Maize can be fermented to produce ethanol, but it is not the most common substrate in the context of the question.
- **Malted Cereals**: Malted cereals, such as barley, are specifically processed to convert starches into sugars, making them ideal substrates for fermentation to produce ethanol.
- **Lactose**: Lactose is a sugar found in milk, but it is not typically used for ethanol production in the same way as starches.
- **None of the Above**: This option implies that none of the listed substrates are suitable, which is not the case here.

5. **Conclusion**: Based on the analysis, malted cereals are the most appropriate substrate for the production of ethanol. The fermentation process described involves malted barley, which is a type of malted cereal.

### Final Answer:
The correct answer is **Malted Cereals**.