Which is an example of a whole-grain complex carbohydrate?

Question

BlackTom AI · Accepted Answer

Whole grains contain the bran, germ, and endosperm, so they provide intact complex carbohydrates (starch and non-digestible fiber) plus vitamins, minerals, and phytochemicals. Complex carbohydrates are polysaccharides that release glucose more slowly than simple sugars due to fiber and structure.

1. Relevant knowledge points and concepts
- Complex carbohydrates = long-chain polysaccharides (starch, fiber). They are found in whole grains, legumes, vegetables.
- Whole grain = grain product that retains bran, germ, and endosperm (e.g., brown rice, whole-wheat, oats).
- Refined grain = bran and germ removed (e.g., white rice, white flour) → lower fiber and nutrients; quicker digestion/higher glycemic response.

2. Step-by-step reasoning
Step 1: Identify whether each option is a whole grain or a refined product.
Step 2: Assess carbohydrate type (complex with fiber vs. predominantly refined starch/simple sugars).

3. Intermediate steps / evaluation of each option
- White bread: Made from refined wheat flour (bran and germ removed). It contains starch but lacks bran/germ fiber → not a whole-grain complex source.
- Water crackers: Typically made from refined flour and often low in fiber; although they contain starch, they are not whole-grain.
- Brown rice: The husk is removed but bran and germ remain; it is an intact whole grain supplying complex carbohydrates and significant dietary fiber.
- All-purpose flour: A refined wheat flour with bran and germ removed; used to make white breads/pastries; not whole-grain.

4. Why the correct answer is correct
Brown rice retains the bran and germ layers that contain fiber and nutrients, so its carbohydrates are primarily complex starches accompanied by fiber. This slows digestion and typifies a whole-grain complex carbohydrate source.

5. Why other options are incorrect
White bread and all-purpose flour are refined products lacking bran/germ, so they are not whole grains. Water crackers are typically made from refined flour and are low in fiber; they are not whole-grain complex carbohydrate sources.

6. Conclusion
Therefore, the example of a whole-grain complex carbohydrate among the choices is brown rice, which matches the provided correct answer: brown rice.

Which is an example of a whole-grain complex carbohydrate?单项选择题

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