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: Medicine
[{'content': 'Kidney size is normal in \nSelect and explain. \nA. Nephronophthisis, B. ADPCKD, C. Acquired renal cysts, D. Medullary sponge kidney', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Kidney size :\nNormal - Medullary sponge kidney, Simple renal cysts.\nSmall - Medullary Cystic kidney, Nephronophthisis .', 'role': 'assistant'}]