Answer:
The food item that would require further instruction is:
Oatmeal.
Oatmeal can be a problematic food for individuals with celiac disease because oats are often processed in facilities that also process wheat, barley, and rye, which are gluten-containing grains. Cross-contamination can occur during processing, making regular oatmeal a potential source of gluten. If the child has celiac disease, it's essential to choose specifically labeled gluten-free oatmeal to avoid gluten exposure. The other food items listed (corn, chicken, and vitamin supplements) do not inherently contain gluten and are generally safe for individuals with celiac disease, but the preparation and source of these items should also be monitored to prevent cross-contamination.
Step-by-step explanation: