This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Surgery
[{'content': 'Oliguria is defined as:- \nSelect and explain. \nA. Absence of urine production, B. More than 900 ml of urine excreted in a day, C. 600 ml to 700 ml of urine excreted in a day, D. Less than 300 ml of urine excreted in a day', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Oliguria is defined as urine production less than 500 ml in a day', 'role': 'assistant'}]