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
[{'content': 'Hepatorenal syndrome feature are - \nSelect and explain. \nA. Urine sodium < 10 mEq/L, B. Normal renal histology, C. Renal function abnormal even after liver become normal, D. Proteinuria < 500 mg/day', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Urine sodium hepatorenal syndrome Patients with low urine sodium excretion (< 10mEq/L) are at a greater risk of HRS. Urine sodium and creatinine levels are also used to calculate the fractional excretion of sodium, which is helpful in differentiating HRS and prerenal azotemia from intrinsic renal disease Ref Harrison20th edition pg 245', 'role': 'assistant'}]