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
Management of Osteoradionecrosis would be: 
Select and explain. 
A. Hyperbaric oxygen, B. Removal of sequestrum, C. Fluoride application, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Treatment of osteoradionecrosis at the present time is unsatisfactory.
Decortication with sequestrectomy and hyperbaric oxygen with antibiotics have been used with limited success because of poor healing after surgery. Conservative approaches with the aim to maintain the integrity of the lower border of the mandible, keeping the site free of infection and the patient free of pain, may in the long-term prove more successful.
The risk for osteoradionecrosis is greater in the presence of odontogenic or periodontal disease and in individuals with poor oral hygiene or ill-fitting dentures.
Patients should be referred for dental care before undergoing a course of radiation therapy to minimize radiation caries and osteoradionecrosis. Radiation caries can be minimized by restoring all carious lesions before radiation therapy and initiating preventive techniques of good oral hygiene and daily topical fluoride.