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': 'According to Atwood residual ridge classiﬁcation order V denotes: \nSelect and explain. \nA. High well-rounded ridge, B. Low well-rounded ridge, C. Knife-edge ridge, D. Depressed ridge', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Order I – Pre-extraction-alveolus bearing tooth\nOrder II – Post-extraction-alveolus after extraction\nOrder III – High, well rounded-high alveolar process\nOrder IV – Knife-edge-High, narrow alveolar process\nOrder V – Low, well-rounded-rounded flat alveolar process\nOrder VI – Depressed-concave flat alveolar process.', 'role': 'assistant'}]