A 45yrs lady is admitted with abdominal pain and anuria. Radiological studies revealed bilateral impacted ureteric stones with hydronephrosis.Urine analysis showed RBCs with pus cells in urine. Serum creatinine level was 14 mg/dl and urea level was 180 mmol/1. Which should be the immediate treatment

• A. J' stent drainage
• B. Hemodialysis
• C. Ureteroscopic removal of stones
• D. Lithotripsy