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': 'The best guide to adequate tissue perfusion in the fluid management of a patient with burns, is to ensure a minimum hourly urine output of ? \nSelect and explain. \nA. 10-30 ml, B. 30-50 ml, C. 50-70 ml, D. 70-100 ml', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 30-50 ml", 'role': 'assistant'}]