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
Drug used for ameliorative test for Myasthenia gravis is 
Select and explain. 
A. Edrophonium, B. Physostigmine, C. Tacrine, D. Pyridostigmine
A: Edrophonium
Answer: A: Edrophonium 
Explanation: 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)