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': 'In Myasthenia gravis, antibodies are present against - \nSelect and explain. \nA. Muscarinic receptor proteins, B. Nicotinic receptor proteins, C. Protein actin, D. Protein myosin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Myasthenia gravis is an autoimmune disorder due to development of antibodies against Nm type of nicotinic receptors.', 'role': 'assistant'}]