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': 'All of the following describe pyogenic abscess except \nSelect and explain. \nA. Clear edge, B. Non - fluctuant, C. Formed pus, D. Well Localised', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pyogenic abscess is fluctuant.', 'role': 'assistant'}]