You have just bought pasteurised milk from the market. However, you do not need the milk right now. Which of these food preservation techniques would you use to keep the milk fresh for later use?

Options

A. Refrigerating
B. Adding sugar
C. Vacuum packing
D. Adding chemical preservatives

Answer

To keep pasteurized milk fresh for later use, follow these steps:

### Step 1: Understand the nature of pasteurized milk
Pasteurized milk has been heated to kill harmful microbes, which helps in prolonging its shelf life. However, it can still spoil due to coagulation.

### Step 2: Identify the causes of spoilage
The main reasons for spoilage in milk are:
1. Microbial growth (which is minimized in pasteurized milk).
2. Coagulation, which can occur due to increased acidity or high temperatures.

### Step 3: Consider food preservation techniques
Now, let's evaluate the given options for preserving the milk:
- **A. Refrigerating**: This method slows down the growth of any remaining microbes and prevents coagulation by keeping the milk at a low temperature.
- **B. Adding sugar**: While sugar can act as a preservative in some foods, it does not effectively preserve milk.
- **C. Vacuum packing**: This method is more suitable for industrial use and is not practical for home use.
- **D. Adding chemical preservatives**: This is unnecessary for pasteurized milk, as it is already treated to eliminate harmful microbes.

### Step 4: Choose the best option
Given the options, the best preservation technique for keeping pasteurized milk fresh is **A. Refrigerating**. This will maintain a low temperature, preventing spoilage and coagulation.

### Final Answer
**A. Refrigerating**

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