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
Reflux filling the pelvicalyceal system with moderate dilatation of ureter is 
Select and explain. 
A. Grade I, B. Grade II, C. Grade IV, D. Grade IV
C: Grade IV
Answer: C: Grade IV 
Explanation: Reflux into ureter without dilation - I
Reflux filling the pelvicalyceal system without dilatation of ureter - II
Reflux filling the pelvicalyceal system with moderate dilatation of ureter- III
Blunting of fornix into pelvicalyceal system - IV
Reflux filling the pelvicalyceal system with dilated and tortorous ureter - V.