This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nephrotic and Nephritic syndrome, Subject name: Medicine
[{'content': 'Muehrcke lines in nails are seen in: \nSelect and explain. \nA. Nephrotic syndrome, B. Bater syndrome, C. Nail-patella syndrome, D. Acute tubular necrosis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Muehrcke's lines are white lines (leukonychia) that extend all the way across the nail and lie parallel to the lunula. Muehrcke's lines - associated with decreased protein synthesis, which occur during metabolic stress & in hypoalbuminemic states such as the nephrotic syndrome. It should not be confused with Half-and-half nail syndrome/Lindsay's nails- most characteristic onychopathy seen in chronic renal failure.", 'role': 'assistant'}]