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: Surgery
[{'content': "Flower 'Vase' pattern of the pelvis in an intravenous urogram is seen in - \nSelect and explain. \nA. Polycystic kidney, B. Renal carcinoma, C. Horse shoe kidney, D. Ectopic kidney", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]