The stage up to which glycolysis and fermenation is common is

Options

A. Dihydroxyacetone
B. 3-Phosphoglyceraldehyde
C. Pyruvate
D. Glucose-6-phosphate

Answer

To solve the question "The stage up to which glycolysis and fermentation is common is," we need to understand the processes of glycolysis and fermentation and identify where they intersect.

### Step-by-Step Solution:

1. **Understanding Glycolysis**:
- Glycolysis is the metabolic pathway that converts glucose into pyruvate. This process occurs in the cytoplasm of the cell and consists of several enzymatic reactions.

2. **Identifying the End Product of Glycolysis**:
- The end product of glycolysis is pyruvate. This is the key molecule that can either enter the Krebs cycle for aerobic respiration or undergo fermentation in the absence of oxygen.

3. **Understanding Fermentation**:
- Fermentation is a metabolic process that occurs when oxygen is not available. It begins with pyruvate, which is produced from glycolysis. In fermentation, pyruvate is converted into other compounds, such as lactic acid or ethanol, depending on the organism.

4. **Determining the Common Stage**:
- Since both glycolysis and fermentation start with glucose and end with pyruvate, the common stage between these two processes is the production of pyruvate. After glycolysis, pyruvate can either proceed to fermentation or enter the Krebs cycle for aerobic respiration.

5. **Conclusion**:
- Therefore, the stage up to which glycolysis and fermentation is common is **pyruvate**.

### Final Answer:
**Pyruvate**