Which of the following pathway is used to convert hexose into pentose sugar?

Options

A. Glycolysis
B. Kreb's cycle
C. Direct oxidation pathway
D. None of these

Answer

To determine which pathway is used to convert hexose into pentose sugar, we can analyze the options provided.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which pathway converts hexose (a six-carbon sugar) into pentose (a five-carbon sugar).

2. **Analyzing the Options**:
- **Option 1: Glycolysis**: This pathway involves the breakdown of glucose (a hexose) into pyruvate. It does not convert hexose into pentose sugar, so this option is incorrect.

- **Option 2: Krebs Cycle (Citric Acid Cycle)**: This cycle primarily deals with the oxidation of acetyl-CoA to release stored energy. It does not convert hexose into pentose sugar, making this option incorrect as well.

- **Option 3: Direct Oxidation Pathway**: This pathway is specifically known for converting hexose sugars into pentose sugars. Therefore, this is the correct option.

- **Option 4: None of these**: Since we have identified a correct pathway in option 3, this option is also incorrect.

3. **Conclusion**: The correct answer is **Option 3: Direct Oxidation Pathway**.