What is the main purpose of preservation by oil and vinegar?

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To extend the shelf life of food

To add color to food

To make food more tender

To add flavor to food

answer is B.

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Detailed Solution

The main purpose of preserving food by using oil and vinegar is to extend its shelf life by slowing down spoilage caused by bacteria and oxidation. The acidic vinegar helps prevent the growth of bacteria, while the oil creates an airtight seal that slows down the oxidation process and prevents the food from drying out. This allows the food to be stored for longer periods of time without spoiling or becoming inedible. Additionally, the combination of vinegar and oil can also impart unique flavors to preserved food, making it a popular technique for making pickled and marinated foods.

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