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
False about acute tubular necrosis 
Select and explain. 
A. BUN/Creat>20, B. Una > 40, C. FeNa > 2%, D. Ucr/Pcr<40
A: BUN/Creat>20
Answer: A: BUN/Creat>20 
Explanation: BUN/Creat  < 20 in ATN.
BUN/Creat  > 20 in pre-renal failure.