Which items contain gluten and should be avoided by patients with celiac disease?

The choice indicating that all the items listed contain gluten and should be avoided by patients with celiac disease is accurate. Specifically, barley is a grain that inherently contains gluten, which can trigger adverse reactions in individuals with celiac disease, an autoimmune disorder.

While rice itself is naturally gluten-free and safe for those with the condition, it is essential to consider that oats can often be contaminated during processing with gluten from other grains like wheat or barley. Therefore, the recommendation to avoid oats is due to the fact that many commercial oat products may not be safe for consumption by those with celiac disease unless they are specifically labeled gluten-free.

The choice reflects a comprehensive understanding of gluten-containing grains. Celiac patients must strictly adhere to a gluten-free diet and should be cognizant of potential cross-contamination in products such as oats, leading to confusion regarding their safety. This is why even though rice is safe, the inclusion of barley and the caution required with oats leads to the conclusion that all items mentioned should be approached with caution.