The fermented food of soybean is

Options

A. Tempeh
B. tofu
C. Sufu
D. All of these

Answer

To answer the question about the fermented food of soybean, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- a) Tempeh
- b) Tofu
- c) Sufu
- d) All of these

2. **Understanding Fermentation**: Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol using microorganisms like bacteria, yeast, or fungi. In the context of soybeans, various fermented products can be made.

3. **Examine Each Option**:
- **Tempeh**: This is a fermented product made from cooked soybeans that have been inoculated with a specific mold (Rhizopus oligosporus). It is a traditional Indonesian food and is rich in protein.
- **Tofu**: Also known as soybean curd, tofu is made by coagulating soy milk and pressing the curds into solid white blocks. While tofu itself is not fermented, it can be used as a base for other fermented products.
- **Sufu**: This is a fermented tofu product, often referred to as fermented bean curd or preserved tofu. It is made by fermenting tofu with specific molds and bacteria.

4. **Conclusion**: Since all three options (tempeh, tofu, and sufu) are related to soybeans and involve fermentation processes (with tempeh and sufu being directly fermented), the correct answer is:
- **d) All of these**

### Final Answer:
The fermented food of soybean is **d) All of these**.