A 74-year-old patient develops an acute rise in creatinine from 100 to 200 µmol/L after starting an ACE inhibitor, with oliguria and hyperkalaemia. What is the most likely diagnosis and next step, according to NICE guidelines?AChronic kidney disease; continue ACE inhibitorBAcute kidney injury; stop ACE inhibitor and review medicationsCPrerenal azotaemia; give IV fluids and continue ACE inhibitorDRapidly progressive glomerulonephritis; start high-dose steroidsEPostrenal obstruction; arrange urgent dialysisCheck my answer