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: Physiology
[{'content': 'What is the osmolarity of urine the influence of ADH? \nSelect and explain. \nA. 50 mOsmol / L, B. 800 mOsmol / L, C. 1200 mOsmol / L, D. 500 mOsmol / L', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ADH will increase water reabsorption into medulla,making low volume,concentrated urine of 1200 - 14000\xa0mOsmol / L\nUrine osmolarity in absence of ADH is 30 - 50\xa0mOsmol / L', 'role': 'assistant'}]