This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, 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: Essentials of medical pharmacology, seventh edition, page no 864, Answer is option 1, Azathioprine This antipurine acts by getting conveed to 6-MP,but has more prominent immunosuppresant action. It mainly supresses cell mediated iimmunity and is mainly used in autoimmune diseases like rheumatoid ahritis, myasthenia gravis, ulcerative collitis etc.