This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Pharmacology
All of the following are side effect of ropinirole except: 
Select and explain. 
A. Sedation, B. Nausea, C. Retroperitoneal Fibrosis, D. Hallucination
C: Retroperitoneal Fibrosis
Answer: C: Retroperitoneal Fibrosis 
Explanation: Ans. (C) Retroperitoneal Fibrosis(Ref: KDT 8/e p 458)Adverse effects of ropinirole and pramipexole include nausea, dizzinesss, hallucinations, postural hypotension and excessive day time sleepinessTheir advantage over ergot derivatives like bromocriptine is lack of retroperitoneal fibrosis and gangrene and long duration of action.Ropinirole has been approved by FDA for restless leg syndrome