This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthetic equipments, Subject name: Anaesthesia
[{'content': 'Hyperbaric Oxygen is not useful in \nSelect and explain. \nA. CO poisining, B. Veigo, C. Gas gangrene, D. compament syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hyperbaric oxygen is not useful in veigo.', 'role': 'assistant'}]