This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney & Ureturs, Subject name: Surgery
[{'content': '"Spider\'s leg" deformity in excretory urogram occurs, in: \nSelect and explain. \nA. Hydronephrosis, B. Polycystic kidney, C. Uretrocele, D. Renal agenesis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Polycystic kidney) (1308-Baily & Love 24th) (1287-88-B &L 25th)Congenial cvstic kidney (Poly cystic kidney) on extretory urogram. There is elongation and deformity of all major and minor calyces resulting in the characteristic {Spider leg or bell like deformity)* "Drooping flower" appearance seen in ectopic ureterocoele* "Cobra head" appearance seen in simple ureterocoele* "Wine-glass" appearance occurs in - congenital hydronephrosis', 'role': 'assistant'}]