<prompt> Pre-renal azotemia is associated with one of the following characteristic feature :Urinary Na 10 mmolLRenal failure index 1Osmolality 500Urinary creatinine P. creatinine ratio 20  <response>: Answer is A Urinary Na 10 mmollitre: Prerenal azotemia is associated with a urinary sodium excretion of less than 10 mmolL. 