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
Drug of choice for myasthenia gravis: 
Select and explain. 
A. Gallamine, B. Succinylcholine, C. Tubocurare, D. Pyridostigmine
D: Pyridostigmine
Answer: D: Pyridostigmine 
Explanation: 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.