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: Dental
[{'content': 'Ratio of diameter of enamel rods in the DEJ to the\nenamel surface is \nSelect and explain. \nA. 1:04, B. 1:01, C. 1:02, D. 2:01', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]