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
Anti–Parkinsonism drug that is a selective COMT inhibitor : 
Select and explain. 
A. Entacapone, B. Ropinirole, C. Pergolide, D. Pramipexole
A: Entacapone
Answer: A: Entacapone 
Explanation: None