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: Pediatrics
[{'content': 'Tumor involves inferior Venacava, what is the staging of Wilms tumour ? \nSelect and explain. \nA. Stage II a, B. Stage III b, C. Stage III, D. Stage IV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tumour extension to\xa0inferior Venacava occurs in\xa0Stage III of\xa0Wilms tumour.', 'role': 'assistant'}]