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: Ans. is 'a' i.e., Renal cell carcinoma Hematuria without other symptoms (silent hematuria) must be regarded as a symptom of tumor of the bladder or kidney until proved otherwise." - Smith's Urology Among the given causes Renal Cell Carcinoma & Wilm's tumor, both can cause gross, painless hematuria. RCC being a much more common cause is the option of choice.