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: Surgery
Epidermoid carcinoma of renal pelvis is usually associated with - 
Select and explain. 
A. Multiple papilomas, B. Pelvic calculus, C. Tuberculosis of kidney, D. Filariasis
B: Pelvic calculus
Answer: B: Pelvic calculus 
Explanation: None