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': 'Esthetically good and strong bonding is shown by: \nSelect and explain. \nA. CFR, B. GFR, C. PFR, D. All of the above.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]