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: Medicine
[{'content': 'Which of the following is not a stage in the progression of community-acquired pneumonia? \nSelect and explain. \nA. Red hepatisation, B. Liquefaction necrosis, C. Edema, D. Grey hepatisation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pathological stages in CAP are\xa0edema, red\xa0hepatization, grey\xa0hepatization\xa0and resolution.', 'role': 'assistant'}]