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: Pediatrics
A child presents with abdominal colic and hematuria on ultrasonography a stone 2.5 cm in diameter is seen in the renal pelvis. The next step in management of this case is : 
Select and explain. 
A. Pyelolithotomy, B. Nephroureterostomy, C. Conservative, D. ESWL
D: ESWL
Answer: D: ESWL 
Explanation: Although there are many methods of renal stone removal, the best is ESWL (extracorporeal shock-wave lithrotripsy].
A conservative approach is chosen only when the stone is upto 0.5 or 0.6 cm.