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
[{'content': 'Reflux filling the pelvicalyceal system with moderate dilatation of ureter is \nSelect and explain. \nA. Grade I, B. Grade II, C. Grade IV, D. Grade IV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Reflux into ureter without dilation - I\nReflux filling the pelvicalyceal system without dilatation of ureter - II\nReflux filling the pelvicalyceal system with moderate dilatation of ureter- III\nBlunting of fornix into pelvicalyceal system - IV\nReflux filling the pelvicalyceal system with dilated and tortorous ureter - V.', 'role': 'assistant'}]