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': 'Bilateral spider leg sign on IVP is suggestive of: \nSelect and explain. \nA. Polycystic kidney, B. Hydronephrosis, C. Hypernephroma, D. Renal stones', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Polycystic kidney', 'role': 'assistant'}]