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: Pharmacology
All of the following are side efffect of ropinirole except: 
Select and explain. 
A. Sedation, B. Nausea, C. Retroperitoneal Fibrosis, D. Hallucination
C: Retroperitoneal Fibrosis
Answer: C: Retroperitoneal Fibrosis 
Explanation: None