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: Surgery
Which among the following is the best method to assess intake of fluid in poly trauma patient: 
Select and explain. 
A. Urine output, B. CVP, C. Pulse rate, D. BP
A: Urine output
Answer: A: Urine output 
Explanation: None