This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development of GU system and Neuro-vascular supply of pelvis & perineum, Subject name: Anatomy
[{'content': "During surgery for a benign cyst on the kidney, the surgeon notes that the patient's right kidney has two ureters and two renal pelvis. This malformation is \nSelect and explain. \nA. An abnormal division of the pronephros, B. An abnormal division of the mesonephros, C. A premature division of the metanephric blastema, D. A premature division of the ureteric bud", 'role': 'user'}, {'content': 'Answer: D \nExplanation: The ureteric bud seems to be preprogrammed to undergo repeated divisions. These divisions normally begin on contact with the metanephric blastema. If the ureteric bud undergoes division prematurely, duplication of the ureter and renal pelvis occurs. In some circumstances, two separate kidneys may form.', 'role': 'assistant'}]