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': 'Antibodies against acetylcholine receptors are seen in September 2009 \nSelect and explain. \nA. Lambe-Eaton-myasthenic syndrome, B. Hypehyroidism, C. Botulism, D. Myasthenia gravis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Myasthenia gravis Myasthenia gravis (MG) is a relatively rare autoimmune disorder of peripheral nerves in which antibodies form against acetylcholine (ACh) nicotinic postsynaptic receptors at the myoneural junction. A reduction in the number of ACh receptors results in a characteristic pattern of progressively reduced muscle strength with repeated use of the muscle and recovery of muscle strength following a period of rest. The bulbar muscles are affected most commonly and most severely, but most patients also develop some degree of fluctuating generalized weakness.', 'role': 'assistant'}]