Domain: commerce (Product Selection and Specification)
Problem: I am shopping for a family member with celiac disease. He needs high-fiber breakfast options but must avoid excessive sugar intake. Looking at the cereal shelves in this supermarket, I need to find the most cost-effective option. Among all the displayed products that are gluten-free certified and have a sugar content of less than 10 grams per 100 grams, which product provides the highest fiber content? Please provide the exact product name.
Answer: Kölln Glutenfreie Haferflocken