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
[{'content': "In the following food items, which one has the highest 'Glycemic Index' \nSelect and explain. \nA. Corn - flakes, B. Brown rice, C. Ice - cream, D. Whole wheat bread", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Glycemic index :\n\nCorn flakes - 80 - 90.\nWhole wheat bread - 70 - 79.\nBrown rice - 60 - 69.\nIce cream - <40.', 'role': 'assistant'}]