Which of the following is NOT considered a gluten-containing food?

Buckwheat is indeed not considered a gluten-containing food. It is a pseudocereal that is naturally gluten-free, making it a popular choice for individuals with celiac disease or non-celiac gluten sensitivity. In contrast, wheat, barley, and rye are all grains that contain gluten, a protein composite that can trigger adverse reactions in sensitive individuals. Gluten is found in wheat, which includes varieties such as spelt, durum, and wheat flour; in barley, which is often used in malt products; and in rye, which is commonly utilized in rye bread and some whiskey production. This makes buckwheat a safe alternative for those avoiding gluten in their diets.