Which of the following is a common dietary source of fiber?

Whole grains are indeed a common dietary source of fiber. Fiber is primarily found in plant-based foods, and whole grains, which are grains that have not been refined and retain their bran, germ, and endosperm, are particularly rich in it. Sources such as brown rice, oatmeal, whole wheat bread, and quinoa provide substantial amounts of dietary fiber, which is beneficial for digestive health, can help regulate blood sugar levels, and contributes to satiety, aiding in weight management.

Other food groups like meat, dairy products, and processed sugars do not contain significant amounts of fiber. Meat is primarily a source of protein and does not provide any fiber. Dairy products also lack fiber content, focusing more on protein and calcium. Processed sugars generally offer empty calories without any nutritional benefits, including fiber. Hence, whole grains stand out as a rich source of dietary fiber within a balanced diet.