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
Edrophonium binds to which site of Acetylcholinesterase 
Select and explain. 
A. Anionic site, B. Esteric site, C. Both the sites, D. Doesn't bind to any site
A: Anionic site
Answer: A: Anionic site 
Explanation: Edrophonium is ultra sho-acting acetylcholinesterase drug which binds only to anionic site Ref: KDT 6th ed pg 104