This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
Which of the following statements about Xanthogranulomatous is not true - 
Select and explain. 
A. Foam cells are seen, B. Associated with tuberculosis, C. Yellow nodules are seen, D. Giant cells may be seen
B: Associated with tuberculosis
Answer: B: Associated with tuberculosis 
Explanation: Xanthogranulomatous pyelonephritis is relatively rare form of chronic pyelonephritis charecterized by accumulation of foamy macrophages intermingled with plasma cells ,lymphocytes,polymorphonuclear leukocytes, and occational giant cells.Often associated with Proteus infections and obstruction,the lesions sometimes produce large , yellow orange nodules that may be grossly confused with renal cell carcinoma. From Pathologic basis of disease Robbins,volum 2 pg no:934