This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney & Ureturs, Subject name: Surgery
[{'content': "The Earliest symptom of Wilm's tumor is: \nSelect and explain. \nA. Hematuria, B. Pyrexia, C. Abdominal mass, D. Metastases", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) Abdominal massRef: Bailey 26th Edition, Page 1304* Wilm's tumor presents with an abdominal mass. Other symptoms include hematuria, abdominal pain or fever", 'role': 'assistant'}]