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: Medicine
Aggravation of myasthenia is a feature of all the following drugs except - 
Select and explain. 
A. Gentamicin, B. Neomycin, C. Edrophonium, D. Succinyl
C: Edrophonium
Answer: C: Edrophonium 
Explanation: None