Answer the following questions :
Name the plastic whose sheets are used for packing liquids.

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the name of a plastic that is used for packing liquids.

2. **Recall Common Plastics**: Think about the different types of plastics that are commonly used in packaging. Some examples include polyethylene, polypropylene, and PVC.

3. **Focus on Liquid Packaging**: Among the plastics mentioned, consider which ones are specifically known for their use in packaging liquids.

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