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': 'Hyperbaric oxygen is indicated for \nSelect and explain. \nA. Obstructive lung diseases, B. Osteoradionecrosis, C. Cardiac failure, D. Renal diseases', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]