This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiac and Pericardiac Imaging, Subject name: Radiology
[{'content': 'Diagnostic feature of RHD is : \nSelect and explain. \nA. McCallam patch, B. Aschoff nodules, C. Shaggy vegetations, D. Bread butter pericarditis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Aschoff nodules Aschoff nodules are focal inflammatory lesions found in any of the three Layers of the heart. They are characteristic of acute rheumatic fever.Aschoff nodules consist ofFibrinoid necrosis*Aschoff giant cells *Histiocytes*Plasma cells*Lymphocytes*Fibroblast*Collagen*", 'role': 'assistant'}]