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': "Edrophonium binds to which site of Acetylcholinesterase \nSelect and explain. \nA. Anionic site, B. Esteric site, C. Both the sites, D. Doesn't bind to any site", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Edrophonium is ultra sho-acting acetylcholinesterase drug which binds only to anionic site Ref: KDT 6th ed pg 104', 'role': 'assistant'}]