This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney & Ureturs, Subject name: Surgery
Yoyo reflex is seen in: 
Select and explain. 
A. Duplication of ureter, B. Polycystic Kidney, C. Melluary sponge kidney, D. Pseudo Kidney
A: Duplication of ureter
Answer: A: Duplication of ureter 
Explanation: Ans. (a) Duplication of ureterRef Internet sources* Yo-Yo Reflex is seen in duplicated system of ureter* The ectopic ureter joins the normal ureter and may cause obstruction or reflex. This is known as Yo-Yo reflex