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': 'Virginia bridge is \nSelect and explain. \nA. Cast perforated resin retained fpd, B. Etched cast resin retained fpd, C. Macroscopic mechanical retention resin retained fpd, D. Chemical bonding resin retained fpd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Macroscopic mechanical retention resin retained FPDs ("virginia bridge")', 'role': 'assistant'}]