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
Short-acting anticholinesterase is: 
Select and explain. 
A. Physostigmine., B. Neostigmine., C. Edrophonium., D. Rivastigmine.
C: Edrophonium.
Answer: C: Edrophonium. 
Explanation: Edrophonium is the short-acting anticholinesterases and is useful in the diagnosis of myasthenia gravis.