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 3 year old girl presents with recurrent UTI. On USG shows hydronephrosis with filling defect and negative shadow of bladder with no ectopic orifice- 
Select and explain. 
A. Vesicoureteric reflux, B. Hydronephrosis, C. Ureterocele, D. Sacrococcygeal teratoma
C: Ureterocele
Answer: C: Ureterocele 
Explanation: None