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': 'The most sensitive test for diagnosis of myasthenia gravis is \nSelect and explain. \nA. Tensilon test, B. Single Fiber Electro-myography, C. Repetitive Nerve Stimulation test, D. Elevated ACH receptor antibodies', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Electromyography is most sensitive test for diagnosing myasthenia gravis', 'role': 'assistant'}]