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
Salt losing nephropathy: September 2012 
Select and explain. 
A. Interstitial nephritis, B. Amyloidosis, C. Lupus nephritis, D. Post-streptococcal GN
A: Interstitial nephritis
Answer: A: Interstitial nephritis 
Explanation: Ans. A i.e. Interstitial nephritis Salt-wasting nephropathy It is a rare syndrome in which renal insufficiency is associated with extracellular volume depletion from marked natriuresis in the absence of adrenal insufficiency or diuretics. A salt-losing nephropathy has been described in Interstitial nephritis, - Chronic pyelonephritis, Polycystic disease, and, paicularly, in Medullary cystic disease.