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': 'What is the best guide for the management of fluid resuscitation? \nSelect and explain. \nA. CVP, B. Blood pressure, C. Oxygen saturation, D. Urine output', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]