This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Antiparkinsonian drug activating D2 receptors directly \nSelect and explain. \nA. Pramipixole, B. Entacapone, C. Benserazide, D. Selegiline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Direct D2 activators are bromcriptine , pergolide,pramipexole,ropinirole. ENtcapone and tolcapone are COMT inhibitors and selegiline is a MAO inbibitor used in PD.In PD there is decrease of dopamine in the substansia nigra. Ref:KDT 6/e p419', 'role': 'assistant'}]