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': 'Which of the following step of osseous surgery removes the widow pick: \nSelect and explain. \nA. Vertical grooving, B. Radicular Blanding, C. Flattening of interproximal bone., D. Gradualizing marginal bone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]