This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
[{'content': 'Minimum urine osmolality that can be human kidney \nSelect and explain. \nA. 100 mOsm/L, B. 80 mOsm/L, C. 50 mOsm/L, D. 20 mOsm/L', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Minimum urine osmolality that can be human kidney is 50mOsm/L Ref: Guyton textbook of medical physiology; 12th edition; page no: 345', 'role': 'assistant'}]