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: Pathology
[{'content': 'You expect a patient in the oliguric phase of renal failure to have a 24 hour urine output less than \nSelect and explain. \nA. 200ml, B. 400ml, C. 800ml, D. 1000ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oliguria is defined as urine output of less than 400ml/24hours', 'role': 'assistant'}]