This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
'Flower vase' appearance on intravenous urogram is seen in 
Select and explain. 
A. Duplex system with upper moeity ureterocele, B. Polycystic kidney disease, C. Horse-shoe kidney, D. Retro-caval ureter
C: Horse-shoe kidney
Answer: C: Horse-shoe kidney 
Explanation: .