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
You expect a patient in the oliguric phase of renal failure to have a 24 hour urine output less than 
Select and explain. 
A. 200ml, B. 400ml, C. 800ml, D. 1000ml
B: 400ml
Answer: B: 400ml 
Explanation: Oliguria is defined as urine output of less than 400ml/24hours