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': 'Facial bevel, proximal ﬂare and chamfer ﬁnish line in a posterior three quarter crown  imparts: \nSelect and explain. \nA. Marginal integrity, B. Structural durability, C. Retention and resistance, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]