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
Flower vase appearance on IVP is seen in: 
Select and explain. 
A. Horseshoe kidney, B. Polycystic kidney, C. Pyonephrosis, D. Congenital megaureter
A: Horseshoe kidney
Answer: A: Horseshoe kidney 
Explanation: Ans. Horseshoe kidney