This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Drug used for ameliorative test for Myasthenia gravis is \nSelect and explain. \nA. Edrophonium, B. Physostigmine, C. Tacrine, D. Pyridostigmine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: KDT 6/e p 104 Drug used in ameliorative test(tensilon test) for Myasthenia gravis is edrophonium. it is a cholinergic drug and can be used for diagnosis of Myasthenia gravis because of a sho duration of action(10-30 min)', 'role': 'assistant'}]