The answer is letter A.
The glycemic index predicts how the blood sugar levels are working within the body. It is a list of carbohydrate-containing foods with their respective sugar content and how it directly affects blood sugar. It is commonly used by diabetic patients to keep track or keep record of their daily food intake. This is an effective way to prevent further aggravation of high sugar in the blood in individuals. Nutritionists are usually the ones responsible for determining glycemic index for diabetic patients.