This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
In the following food items, which one has the highest 'Glycemic Index' 
Select and explain. 
A. Corn - flakes, B. Brown rice, C. Ice - cream, D. Whole wheat bread
A: Corn - flakes
Answer: A: Corn - flakes 
Explanation: Glycemic index :

Corn flakes - 80 - 90.
Whole wheat bread - 70 - 79.
Brown rice - 60 - 69.
Ice cream - <40.