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: Pediatrics
[{'content': 'In children renal failure is defined as \nSelect and explain. \nA. Urine output less than 0.5ml/kg/hr for 8hr, B. estimated creatinine clearance decrease by 50%, C. Urine output less than 0.3ml/kg/hr for 24hr, D. Loss of renal function > 3 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]