Explanation:

- Option 1: Vinegar

- Sawdust is not used to adulterate vinegar. Vinegar is usually diluted with water or mixed with other vinegars to adulterate.

- Option 2: Cheese

- Sawdust is not typically used to adulterate cheese. Cheese adulteration might involve using inferior milk or adding vegetable oils.

- Option 3: Coriander Powder

- Sawdust is often used to adulterate coriander powder. It's a cheap filler that increases weight without being easily detected.

- Option 4: Milk

- Sawdust is not used to adulterate milk. Common milk adulterants include water, starch, or detergent.

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