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
Hyperbaric oxygen is useful in ? 
Select and explain. 
A. Tetanus, B. Gas gangrene, C. Frostbite, D. Vincent's angina
B: Gas gangrene
Answer: B: Gas gangrene 
Explanation: Ans. is 'b' i.e. Gas gangrene The Undersea and Hyperbaric Medical Society (UHMS) currently recognizes hyperbaric oxygen therapy (HBO) as an approved therapy for 13 pathologic entities. These are conditions for which HBO has substantial scientific suppo demonstrating therapeutic benefit. Hyperbaric oxygen is currently considered a primary treatment modality for - carbon monoxide poisoning, cerebral aerial gas embolism, osteoradionecrosis, decompression sickness, and clostridial gas gangrene. It is also considered an adjunctive therapy for acute exceptional blood loss anemia, acute thermal burns, compromised skin grafts or skin flaps, crush injury, compament syndrome, necrotizing soft-tissue infections, non-clostridial gas gangrene, radiation tissue damage, refractory osteomyelitis, selected problem wounds, and intracranial abscesses. Treatment of frostbite injuries with HBO is considered experimental. The treatment protocol for frostbite includes rapid rewarming, close observation, elevation and splinting, daily hydrotherapy, and serial debridements.- Schwaz 9/e p409