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': 'False about acute tubular necrosis \nSelect and explain. \nA. BUN/Creat>20, B. Una > 40, C. FeNa > 2%, D. Ucr/Pcr<40', 'role': 'user'}, {'content': 'Answer: A \nExplanation: BUN/Creat\xa0 < 20 in ATN.\nBUN/Creat\xa0 > 20 in pre-renal failure.', 'role': 'assistant'}]