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: Radiology
[{'content': 'A patient requires tooth extractions from an area that has been subjected to radiation therapy. Which of the following represents the greatest danger to this patient: \nSelect and explain. \nA. Alveolar osteitis, B. Osteoradionecrosis, C. Prolonged healing, D. Fracture of the mandible', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]