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: Pathology
[{'content': 'Muddy brown casts are seen in \nSelect and explain. \nA. Chronic renal failure, B. Acute tubular necrosis, C. Nephrotic syndrome, D. Nephritic syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Muddy brown casts made up of epithelial cells are pathognomonic for Acute tubular necrosis.', 'role': 'assistant'}]