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: Pharmacology
Which of the following is not given in myasthenia gravis : 
Select and explain. 
A. Clofibrate, B. Polymixin B, C. Penicillin, D. All
B: Polymixin B
Answer: B: Polymixin B 
Explanation: None