This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney and ureter, Subject name: Surgery
[{'content': 'What is the preferred treatment option for 1.5 cm stone located in lower third of ureter? \nSelect and explain. \nA. ESWL, B. PCNL, C. URS, D. Ureterolithotomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Management of Ureteric Stone- Depends on location of stone* Stone in upper and middle 1/3rd of ureter- Size of stone up to 1cm - ESWL > URS- Size of stone > 1cm - URS* Stone in lower 1/3rd of ureter - URS (No use of shockwaves in this area)', 'role': 'assistant'}]