This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
A 50 year old female is admitted with abdominal pain and anuria. Radiological studies reveal bilateral impacted ureteric stones with hydronephrosis. Urine analysis showed RBCs with pus cells in urine. Serum creatinine level was 16mg/dL and blood urea level was 200 mmol/L; which of the following should be the immediate treatment. 
Select and explain. 
A. Lithotripsy, B. Ureteroscopic removal of stones, C. 'J' stent drainage, D. Hemodialysis
C: 'J' stent drainage
Answer: C: 'J' stent drainage 
Explanation: None