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
Painless gross hematuria occurs in 
Select and explain. 
A. Renal cell carcinoma, B. Polycystic kidney, C. Stricture of urethra, D. Wilm's tumor
A: Renal cell carcinoma
Answer: A: Renal cell carcinoma 
Explanation: None