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 is the most reliable parameter to assess fluid intake in a poly trauma patient? 
Select and explain. 
A. Urine output, B. Body temperature, C. BP, D. Pulse rate
A: Urine output
Answer: A: Urine output 
Explanation: CVP is the best measurement but since it's not given here go for urine output can be considered as the next best.