Oxidative phosphorylation refers to

Options

A. Anaerobic production of ATP
B. The citric acid cycle production of ATP
C. Production of ATP by chemiosmosis
D. Alcoholic fermentation

Answer

### Step-by-Step Solution:

1. **Understanding Oxidative Phosphorylation**:
- Oxidative phosphorylation is a metabolic process that occurs in the mitochondria of aerobic organisms. It is primarily responsible for the production of ATP, the energy currency of the cell.

2. **Identifying the Options**:
- The question provides four options:
1. Anaerobic production of ATP
2. Citric acid cycle production of ATP
3. Production of ATP by chemiosmosis
4. Alcoholic fermentation

3. **Analyzing Each Option**:
- **Option 1: Anaerobic production of ATP**: This is incorrect because oxidative phosphorylation requires oxygen and is an aerobic process.
- **Option 2: Citric acid cycle production of ATP**: While the citric acid cycle does produce ATP, it does not involve the transfer of electrons in the same way as oxidative phosphorylation. Therefore, this option is also incorrect.
- **Option 3: Production of ATP by chemiosmosis**: This is correct. Oxidative phosphorylation involves the movement of protons (H+ ions) across the mitochondrial membrane, creating a gradient that drives ATP synthesis through chemiosmosis.
- **Option 4: Alcoholic fermentation**: This is an anaerobic process and does not relate to oxidative phosphorylation, making it incorrect.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Option 3: Production of ATP by chemiosmosis**.