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': "Earliest symptom of Wilm's tumour \nSelect and explain. \nA. Hematuria, B. Pyrexia, C. Abdominal mass, D. Metastases", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]