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
[{'content': 'Which among the following is the best method to assess intake of fluid in poly trauma patient: \nSelect and explain. \nA. Urine output, B. CVP, C. Pulse rate, D. BP', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]