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': 'Spheroiding technique is one of the \nSelect and explain. \nA. Regeneration procedure, B. Resective osseous surgery, C. Gingival augmentation procedure, D. Gingival extension procedure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]