Which food is a rich source of folate?

Folate, also known as vitamin B9, is essential for various bodily functions, particularly for DNA synthesis and repair, as well as during periods of rapid growth such as pregnancy. Each of the foods listed contributes to dietary folate intake, making them all valuable sources.

Dark green leafy vegetables, such as spinach, kale, and broccoli, are particularly high in folate. They are among the best plant sources of this vitamin, often providing a substantial portion of the daily recommended intake in just one serving.

Citrus fruits, including oranges and grapefruits, also contain good amounts of folate. While they are not as concentrated in folate as leafy vegetables, they still contribute to overall dietary intake.

Whole grains, such as quinoa, barley, and fortified cereals, are another important source of folate. They provide not only folate but also fiber and various other nutrients that are beneficial for health.

Therefore, recognizing that each of these food groups supplies folate means that "all of the above" is indeed the correct answer. All these foods should be included in a balanced diet to ensure adequate intake of folate and other essential nutrients.