Which of the following is an example of a residue?

• A. A small amount of pesticide found on produce.
• B. A tiny amount of mercury found in fish.
• C. A trace amount of lead found in drinking water.
• D. A negligible amount of dioxin found in animal fat.

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the definition of a residue in the context of nutrition and food safety. A residue typically refers to a small amount of a chemical substance, such as pesticides, veterinary drugs, or contaminants, that remains on or in food after it has been processed or treated.
2. Step 2: Identify the examples given in the problem: pesticide on produce, mercury in fish, lead in drinking water, and dioxin in animal fat.
3. Step 3: Recognize that residues are usually associated with substances applied to or used on food products, such as pesticides on crops or veterinary drugs in animals, rather than environmental contaminants like mercury or lead that accumulate naturally or through pollution.
4. Step 4: Analyze each option to see which fits the residue definition best. Pesticide on produce is a classic example of a residue because pesticides are applied intentionally during farming and small amounts can remain on the food.
5. Step 5: Conclude that the small amount of pesticide found on produce is the best example of a residue, as it directly relates to substances applied during food production that remain on the food.