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
Hepatorenal syndrome feature are -a) Urine sodium < 10 mEq/Lb) Normal renal histologyc) Renal function abnormal even after liver become normald) Proteinuria < 500 mg/day 
Select and explain. 
A. ac, B. a, C. ab, D. bc
C: ab
Answer: C: ab 
Explanation: None