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 an example of non graft associated regenerative technique? \nSelect and explain. \nA. HTR polymer, B. Bioactive glass, C. Osseous cogulum, D. GTR', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]