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': 'Extensive surgical debridement, decompression or amputation may be indicated in the following clinical setting except - \nSelect and explain. \nA. Progressive synergistic gangrene, B. Acute thrombophlebitis, C. Acute haemolytic streptococcal cellulitis, D. Acute rhabdomyolysis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Acute thrombophlebitis", 'role': 'assistant'}]