Medicine General 6e4dd621 Investigation in a patient of oliguria revealed Urine osmolity 620 mosm/kg Urine sodium :12mmol/L Urine /plasma urea ratio :13 :1 The most likely diagnosis is - A Prerenal acute renal failure B Acute tubular recrosis C Acute cortical necrosis D Urinary tract obstruction High-Yield Explanation No explanation provided.