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: Surgery
[{'content': 'Before radiotherapy tooth is removed prophylactically in order to avoid: \nSelect and explain. \nA. Radiation caries., B. Radiation pulpitis., C. Osteoradionecrosis., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]