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
[{'content': "Painless gross hematuria occurs in ? \nSelect and explain. \nA. Renal cell carcinoma, B. Polycystic kidney, C. Stricture of urethra, D. Wilm's tumor", 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]