This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Drug used in ameliorative test for myasthenia gravis is 
Select and explain. 
A. d-TC, B. Edrophonium, C. Pyridostigmine, D. Tacrine
B: Edrophonium
Answer: B: Edrophonium 
Explanation: .