This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Which of the following is not a cholinergic agent \nSelect and explain. \nA. Galantamine, B. Donepezil, C. Tacrine, D. Piracetam', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ref: HL sharma 3rd ed pg no: 545 Piracetam, aniracetam are nootropic agents(sma drugs) used in Alzheimer's remaining drugs increase cholinergic activity in Alzheimer's", 'role': 'assistant'}]