This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute Kidney Injury, Subject name: Medicine
[{'content': 'Anuria is defined as urine output less than? \nSelect and explain. \nA. 4 ml/hr, B. 8 ml/hr, C. 12 ml/hr, D. 16 ml/hr', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oliguria <400ml/day Anuria <100 ml/ day', 'role': 'assistant'}]