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': 'The renal tumour which has multicentric origin - \nSelect and explain. \nA. Squamous cell carcinoma, B. Renal cell, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Wilm\'s tumor Wilms tumor o Wilms tumor is the most common primary renal tumor of childhood. o Usual age for diagnosis is 2-5 years. o Approximately 5% to 10% of Wilms tumors involve both kidney, either simultaneously or one after the other. o Nephrogenic rests are the precursor lesions of Wilms Tumor. o Most children with wilms tumors present with a large abdominal mass. o Less common presentations are hematuria, abdominal pain, intestinal obustruction, and hypeension. o "10% of Wilms tumors are either bilateral or multicentric at the time of diagnosis". - Robbin\'s', 'role': 'assistant'}]