Which one of the following options is an example of a non-milk extrinsic sugar?

Dextrose is categorized as a non-milk extrinsic sugar because it is a simple sugar (monosaccharide) that can be found naturally in fruits and is often produced artificially as well. It is not derived from milk, distinguishing it from options that include sugars found in milk or products associated with it, such as lactose, which is the sugar specifically found in milk.

Fructose, while also a simple sugar, is naturally found in fruits and honey but isn’t classified under the term "extrinsic" in the same manner dextrose is, as extrinsic sugars are typically those added to food or processed apart from their natural context and often associated with dental health concerns.

Lactose is the sugar found in milk, making it an intrinsic sugar rather than an extrinsic one. Maltose, which is a disaccharide made up of two glucose units, is primarily found in malted foods and beverages and is not considered a non-milk extrinsic sugar either.

Thus, dextrose is an example of a non-milk extrinsic sugar since it fits within the parameters of added sugars and has no direct relation to milk products.