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 is not an osteoplasty technique: \nSelect and explain. \nA. Vertical grooving., B. Radicular blending., C. Gradualizing marginal bone., D. None.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Steps in osseous respective surgery\nVertical grooving and Radicular blending\xa0→ Osteoplasty techniques flatting of interproximal bone\xa0and gradualizing marginal bone → Osteotomy', 'role': 'assistant'}]