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': 'In the maxilla, lack of stability was how many times more prevalent than lack of retention? \nSelect and explain. \nA. 1.8 times, B. 4 times, C. 5.8 times, D. 7 times', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In the maxilla, lack of stability - 7 times more prevalent than lack of retention.\nIn the mandible, lack of stability - 1.8\xa0times more\xa0prevalent than lack of retention.', 'role': 'assistant'}]