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': 'After endodontic therapy has been perfomed on a\nmandibular molar with both periodontal bifurcation involvement and bifurcation caries: \nSelect and explain. \nA. Hemisection, B. Fenestration, C. Root amputation, D. Apical curettage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]