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': 'Cause of salt Losing Nephropathy \nSelect and explain. \nA. Interstitial nephropathy, B. Maintenance phase of acute tubular necrosis, C. Post  - Streptococcal Glomerulonephritis, D. IgA nephropathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Causes :\nReflux\xa0Nephropathy.\nInterstitial nephropathy.\nPost - obstructive uropathy.\nMedullary Cystic disease.\nRecovery phase of ATN.', 'role': 'assistant'}]