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
[{'content': 'Drug of choice for myasthenia gravis: \nSelect and explain. \nA. Gallamine, B. Succinylcholine, C. Tubocurare, D. Pyridostigmine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer is D (Pyridostigmine): Pyridostigmine is the most widely used anticholinesterase medication in Myaesthenia Gravis. Pyridostigmine's the single best answer of choice amongst the options provided.", 'role': 'assistant'}]