This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pathology
A15 year old boy presented with pancarditis, on myocardial biopsy, following finding was seen. Diagnosis? 
Select and explain. 
A. Aschoff nodule, B. TB, C. FB giant cells, D. None
A: Aschoff nodule
Answer: A: Aschoff nodule 
Explanation: Ans. (a) Aschoff noduleHere one can see collection of foci of swollen eosinophilic collagen surrounded by: Lymphocytes (primary T cells), Occasional plasma cells, Aschoff giant cells Q (macrophages of rheumatic fever) Q and Antischkow cells (cells with caterpillar like chromatin marked with an arrow)