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: Pathology
[{'content': 'Which one of the listed statements is the best histologic definition of an abscess? \nSelect and explain. \nA. A circumscribed collection of neutrophils with necrotic cellular debris, B. A localized defect that results from the sloughing of necrotic inflammatory tissue from the surface of an organ, C. A localized proliferation of fibroblasts and small blood vessels, D. An aggregate of two or more activated macrophages', 'role': 'user'}, {'content': 'Answer: A \nExplanation: An abscess is a localized collection of neutrophils and necrotic debris. It is basically a localized form of suppurative (purulent) inflammation, which is associated with pyogenic bacteria and is characterized by edema fluid admixed with neutrophils and necrotic cells (liquefactive necrosis or pus).', 'role': 'assistant'}]