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: Medicine
[{'content': 'True statement regarding oliguria: March 2008 \nSelect and explain. \nA. Urine formation less than 50 mL/ 24 hours, B. Urine formation less than 250 mL/ 24 hours, C. Urine formation of less than 500 mL/24 hours, D. Urine formation less than 750 mL/24 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Urine formation of less than 500 mL/24 hours Oliguria is defined as a urine output that is Less than 1 mL/kg/h in infants, Less than 0.5 mL/kg/h in children, and Less than 500 mL/day in adults Anuria is complete absence of urine formation(less than 50 mL)', 'role': 'assistant'}]