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': 'A 35 year old female has proximal weakness of muscles, ptosis and easy fatigability. The most sensitive test to suggest the diagnosis is: \nSelect and explain. \nA. Muscle Biopsy, B. CPK levels, C. Edrophonium test, D. Single fiber EMG', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Single fibre electrophysiology is the most sensitive test for Myasthenia Gravis. The symptoms given in question stem are suggestive of Myasthenia Gravis which is an autoimmune neuromuscular disorder presenting with easy fatigability. Ref: Clinical adult neurology By Jody Corey-Bloomn, Page 332', 'role': 'assistant'}]