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: Pathology
[{'content': 'Most specific test for myasthenia gravis \nSelect and explain. \nA. Antibodies to Ach receptors, B. Electrophysiological studies, C. Tensilon test, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Autoimmune mediated neuromuscular disease is an example of type II hypersensitivity reaction.\nBefore 40 years of age, it is most commonly seen in women, but it occurs equally in both sexes in older patients.\nDistinct finding: ↓ Ach receptors (in muscles) and circulating antibodies to Ach receptors.\nMost specific test: Antibodies to Ach receptors.\nElectrophysiological studies: ↓ in motor response on repeated stimulation.\nNerve conduction studies: Normal.\nTreatment is done with drugs (neostigmine with atropine) and thymectomy.', 'role': 'assistant'}]