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': 'What are the objectives of furcation therapy: \nSelect and explain. \nA. Facilitate maintenance., B. Prevent further attachment loss., C. Obliterate the furcation defects as a periodontal maintenance problem., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The objectives of furcation therapy are to\n\nFacilitate maintenance\nPrevent further attachment loss and\nObliterate the furcation defects as a periodontal maintenance problem. The selection of therapeutic mode varies with the class of furcation involvement, the extent and configuration of bone loss, and other anatomic factors.', 'role': 'assistant'}]