This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pediatrics, environment and nutrition, Subject name: Pathology
[{'content': 'The most impoant prognostic factor of Wilms tumor- \nSelect and explain. \nA. Histopathology, B. Ploidy of cells, C. Age < 1 y, D. Mutation of c 1p gene', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Robbins basic pathology 10th edition page no 290. Wilms tumor or nephroblastoma is the most common primary tumor of the kidney in children. On microscopic examination, Wilms tumors are characterized by recognizable attempts to recapitulate different stages of nephrogenesis. The pattern of anaplastic cells within the primary tumor has impoant implications for prognosis.', 'role': 'assistant'}]