Pasteurization is done at:

Options

A. `100^@ C`
B. `30^@ C`
C. `70^@ C`
D. `45^@ C`

Explanation

**Step-by-Step Solution:**

1. **Understanding Pasteurization**: Pasteurization is a process named after Louis Pasteur, which involves heating liquids to kill harmful microorganisms without significantly affecting the liquid's quality.

2. **Purpose of Pasteurization**: The primary purpose of pasteurization is to preserve food, particularly liquids like milk, by eliminating pathogens that can cause spoilage or disease.

3. **Temperature for Pasteurization**: The question asks at what temperature pasteurization is typically done. The options provided are:
- A) 100 degrees Celsius
- B) 30 degrees Celsius
- C) 70 degrees Celsius
- D) 45 degrees Celsius

4. **Identifying the Correct Temperature**: Pasteurization usually occurs at a temperature of around 70 degrees Celsius. This temperature is sufficient to kill most harmful bacteria while preserving the quality of the liquid.

5. **Conclusion**: Therefore, the correct answer to the question is **C) 70 degrees Celsius**.

---