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: Radiology
[{'content': "Spider leg deformity of calyces on 1VP is seen in: \nSelect and explain. \nA. Hypernephroma, B. Hydronephroses, C. Wilm's tumor, D. Pyelonephritis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Hypernephroma', 'role': 'assistant'}]