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
B/L spider leg sign on IVP suggests 
Select and explain. 
A. Renal stone, B. Polycystic kidney, C. Hypernephroma, D. Hydronephrosis
B: Polycystic kidney
Answer: B: Polycystic kidney 
Explanation: B i.e. Polycystic Kidney