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': 'Decreased fractional excreion of sodium is caused by - \nSelect and explain. \nA. Prerenal azotemia, B. Coical ischemia, C. Glomerulonephritis, D. Renal tubular acidosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: FeNa(fractional excretion of sodium) is - <1% in prenal azotemia Early in the course of sepsis associated AKI. Rhabdomyolysis ,hemolysis associated AKI Contrast nephropathy >1% in Ischemia associated AKI in the late course of sepsis associated AKI Tubular injury or ATN. Ref:Harrison 20 th edition pg no 2105 tab -304.1', 'role': 'assistant'}]