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
[{'content': 'All aggravates myastheia gravis,except ? \nSelect and explain. \nA. Azathioprine, B. Quinidine, C. Tetracycline, D. Aminoglycoside', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Azathioprine o Tetracycline, aminoglycoside and quinidine can aggravate mysthenia gravis.", 'role': 'assistant'}]