This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
In tubular necrosis, ratio of urine plasma creatinine is- 
Select and explain. 
A. 20, B. 40, C. 20-30, D. 30-40
A: 20
Answer: A: 20 
Explanation: Ref the image urine/plasma creatinine ratio less than 20 suggest acute tubular necrosis Ref Harrison20th edition pg 277