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
Polyuria with low fixed specific gravity urine is seen in? 
Select and explain. 
A. Diabetes mellitus, B. Diabetes insipidus, C. Chronic glomerulonephritis, D. Potomania
C: Chronic glomerulonephritis
Answer: C: Chronic glomerulonephritis 
Explanation: Ans. is 'c' i.e., Chronic glomerulonephritis o Polyuria with fixed low specific gravity is a feature of chronic glomerulonephritis.o Isosthenuria# Refers to the excretion of urine whose specific gravity (concentration) is neither greater (more concentrated) nor less (more dilute) than that of protein-free plasma, typically 1 008-1 012.# Isothenuria reflects renal tubular damage/failure of renal medullary function.o Potomonia# Is known as beer drinkers hyponatremia and hypo-osmolality syndrome, related to massive consumption of beer.