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': 'Antibody found in patients of myaesthenia gravis is directed against - \nSelect and explain. \nA. Acetycholine, B. Acetycholine receptors, C. Acetycholine vesicles in nerve terminal, D. Actin-myosin complex of the muscle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]