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: Pathology
[{'content': "A renal tumour which has a multicentric origin - \nSelect and explain. \nA. Wilm's tumour, B. Transitional cell carcinoma, C. Squamous cell carcinoma, D. Renal cell", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Wilms tumor \n\nWilms tumor is the most common primary renal tumor of childhood.\nThe usual age for diagnosis is 2-5 years.\nApproximately 5% to 10% of Wilms tumors involve both kidney, either simultaneously or one after the other.\nNephrogenic rests are the precursor lesions of Wilms Tumor.\nMost children with Wilms tumors present with a large abdominal mass.\nLess common presentations are hematuria, abdominal pain, intestinal obstruction, and hypertension.\n"10% of Wilms tumors are either bilateral or multicentric at the time of diagnosis". - Robbin\'s', 'role': 'assistant'}]