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: Biochemistry
Anticholinesterase that binds only with the anionic site is 
Select and explain. 
A. Physostigmine, B. Edrophonium, C. Neostigmine, D. Echothiophate
B: Edrophonium
Answer: B: Edrophonium 
Explanation: .