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 is not an osteoplasty technique: 
Select and explain. 
A. Vertical grooving., B. Radicular blending., C. Gradualizing marginal bone., D. None.
C: Gradualizing marginal bone.
Answer: C: Gradualizing marginal bone. 
Explanation: Steps in osseous respective surgery
Vertical grooving and Radicular blending → Osteoplasty techniques flatting of interproximal bone and gradualizing marginal bone → Osteotomy