This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Diagnosis of myasthenia gravis is done by using: 
Select and explain. 
A. Edrophonium, B. Neostigmine, C. Succinylcholine, D. Atropine
A: Edrophonium
Answer: A: Edrophonium 
Explanation: Ans. (A) Edrophonium(Ref: KDT 8th/e p120-121)Myasthenia gravis can be differentiated from cholinergic crisis with the help of a short acting anticholinesterase agent, edrophonium. It improves the symptoms in myasthenia gravis whereas worsens the condition in cases of cholinergic crisis. Neostigmine is used for the treatment of myasthenia.