This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lung Tumors, Subject name: Pathology
[{'content': 'Small cell Ca lung, DNA of the necrotic cells get deposited on vessels? \nSelect and explain. \nA. Psammoma body, B. Azzopardy effect, C. Button collar lesion, D. Necrotic diathesis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: Internet SourcesExplanation:Azzopardi phenomenon:In necrotic areas of tumor, dark blue DNAliberated from dead cells sometimes coats vessel walls.The tumor cells surrounding the vessels show coagulative necrosis. The pink area at the lower right shows karyolysis of tumor nuclei.', 'role': 'assistant'}]