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
Osteoradionecrosis results from: 
Select and explain. 
A. Infection, trauma, radiation, B. Radiation, trauma, infection, C. Trauma, radiation, infection, D. None of the above
B: Radiation, trauma, infection
Answer: B: Radiation, trauma, infection 
Explanation: None