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
Which of the following step of osseous surgery removes the widow pick: 
Select and explain. 
A. Vertical grooving, B. Radicular Blanding, C. Flattening of interproximal bone., D. Gradualizing marginal bone
D: Gradualizing marginal bone
Answer: D: Gradualizing marginal bone 
Explanation: None