This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Shock, Subject name: Surgery
Optimum urine output in post-operative patient:- 
Select and explain. 
A. 1 ml/kg, B. 2 ml/kg, C. 3 ml/kg, D. 4 ml/kg
A: 1 ml/kg
Answer: A: 1 ml/kg 
Explanation: Urine output of more than 1 mL/kg is an adequate measure of renal perfusion in the absence of underlying renal disease.