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': 'Disproportionately increased blood urea levels compared to serum creatinine (urea creatinine ratio 20:1) can be seen in the following except - \nSelect and explain. \nA. Prerenal failure, B. CCF, C. Intrinsic renal failure, D. Hypovolumia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]