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': 'Dr. Sunil used edrophonium for differentiating a myasthenic crisis from the cholinergic crisis. He preferred it over other anticholinesterase agents because of its: \nSelect and explain. \nA. Shorter duration of action, B. Longer duration of action, C. Direct action on muscle end plate, D. Selective inhibition of true cholinesterase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Edrophonium- Short-acting anticholinesterase.\nIn Myasthenia gravis, edrophonium improves the condition.', 'role': 'assistant'}]