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': 'Short-acting anticholinesterase is: \nSelect and explain. \nA. Physostigmine., B. Neostigmine., C. Edrophonium., D. Rivastigmine.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Edrophonium is the short-acting anticholinesterases and is useful in the diagnosis of myasthenia gravis.', 'role': 'assistant'}]