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: Medicine
[{'content': 'Dispropoionately 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. Hypovolemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Intrinsic or intrarenal acute renal failure (ARF) occurs when direct damage to the kidneys causes a sudden loss in kidney function. The most common causes of intrinsic acute renal failure are acute tubular necrosis (ATN), acute glomerulonephritis (AGN), and acute interstitial nephritis (AIN) . Ref Harrison20th edition pg 236', 'role': 'assistant'}]