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: Surgery
[{'content': 'Submucosal vestibuloplasty as a ridge extension procedure was described by? \nSelect and explain. \nA. Trauner, B. Obwegeser, C. Baumer, D. Visor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Self explanatory', 'role': 'assistant'}]