This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pediatrics
[{'content': 'Maximum urine osmolality in preterm neonate: \nSelect and explain. \nA. 200, B. 400, C. 500, D. 800', 'role': 'user'}, {'content': 'Answer: C \nExplanation: c. 500(Ref: Nelson 20/e 349; Pediatric Urology By John G. Gearhart pg 15-20)Premature infants have an even more limited capacity to concentrate their urine than those born at term, with a maximum urine osmolality of about 500mOsm/kgH2 O.', 'role': 'assistant'}]