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': 'During extraction of lower impacted right molar, the bone is removed: \nSelect and explain. \nA. To expose maximum dimension of tooth, B. Upto CE junction, C. Upto furcation area, D. Upto half of roots', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]