This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': 'Which of the following is not true for diagnosis of gas gangrene? \nSelect and explain. \nA. Pain out of propoion to necrotic tissue, B. Hyperbaric oxygen is best treatment, C. Extensive surgical debridement, D. Gas visible on radiograph', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Gas Gangrene: MC organism involved: Clostridium Perferinges/Welchii -->myonecrosis and rapid spread of infections. The gas in the tissue cause crepitus. Surgical Debridement is done. Hyperbaric O2 is SOMETIMES used in the treatment of the wound.', 'role': 'assistant'}]