This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Anatomy
[{'content': 'A 40-yr-old patient with a single kidney presents with a solitary exophytic mass of 4 cm localized at its lower pole. Which amongst the following is the best-recommended management option: \nSelect and explain. \nA. Radical nephrectomy, B. Radical nephrectomy with dialysis, C. Radical nephrectomy with renal transplantation, D. Paial nephrectomy', 'role': 'user'}, {'content': "Answer: D \nExplanation: Paial nephrectomy is the preferred surgical approach for a small (<4cm) localized tumor; especially in patients with a functionally or anatomically solitary kidney. Paial nephrectomy should be considered in the following clinical situations: Renal masses less than 4cm (T1) Localized mass in a patient with a single kidney or with compromised renal function. Synchronous bilateral renal tumors Patients with Von-Hippel-Lindau syndrome as they are at high risk of renal cancer in the contralateral kidney Ref Bailey and love 27e Kidney and ureter , Srb's manual of surgery 5e p993", 'role': 'assistant'}]