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
[{'content': '55yr old man with dementia was given a natural alkaloid which of the following? \nSelect and explain. \nA. Tacrine, B. Donepezil, C. Galantamine, D. Rivastigmine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Galantamine Galantamine: It is a natural alkaloid which selectively inhibits cereral acetylcholinesterase and has some direct agonistic action on nicotinic receptors as well. It has produced cognitive and behavioural benefits in alzheimers disease.", 'role': 'assistant'}]