Which of the following reactions does not release `CO_2` ?

Options

A. Alcohol fermentation
B. Aerobic respiration
C. Lactic acid fermentation
D. Amphibolic pathway

Answer

To determine which of the following reactions does not release CO2, we will analyze each option provided:

1. **Alcohol Fermentation**:
- In this process, glucose is broken down into pyruvic acid, which is then converted into ethanol (C2H5OH) and carbon dioxide (CO2) in the absence of oxygen.
- **Conclusion**: This reaction releases CO2.

2. **Aerobic Respiration**:
- This process occurs in the presence of oxygen. Pyruvic acid is completely oxidized to produce carbon dioxide (CO2), water (H2O), and a large amount of energy (ATP).
- **Conclusion**: This reaction also releases CO2.

3. **Lactic Acid Fermentation**:
- In this anaerobic process, pyruvic acid is converted into lactic acid (C3H6O3) without the release of carbon dioxide. It occurs in certain bacteria and animal cells when oxygen is scarce.
- **Conclusion**: This reaction does not release CO2.

4. **Amphibolic Pathway**:
- This pathway involves both catabolic and anabolic processes and can include various metabolic reactions. However, it typically involves the breakdown of substrates that can lead to the production of CO2.
- **Conclusion**: Generally, this pathway can release CO2 depending on the specific reactions involved.

Based on the analysis, the only reaction that does not release CO2 is **Lactic Acid Fermentation**.

### Final Answer:
**Lactic Acid Fermentation does not release CO2.**

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