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: Radiology
Adder – head appearance on voiding cystourethrogram in bladder is feature of – 
Select and explain. 
A. Horse shoe kidney, B. VUR, C. Ureterocele, D. Carcinoma of bladder
C: Ureterocele
Answer: C: Ureterocele 
Explanation: None