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: March 2004 \nSelect and explain. \nA. Hematuria, B. Pyrexia, C. Abdominal mass/ tumour, D. Metastasis", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. Abdominal mass/ tumour', 'role': 'assistant'}]