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
All of the following can aggravate Myasthenia gravis except : 
Select and explain. 
A. Azathioprine, B. d–Tubocurarine, C. Tetracycline, D. Aminoglycoside
A: Azathioprine
Answer: A: Azathioprine 
Explanation: None