This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Myasthenia gravis is associated with- \nSelect and explain. \nA. Antibodies against Ach receptors, B. Decreased myosin, C. Absent troponin C, D. Increased myoneural junction transmission', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *MG is an autoimmune disease most commonly caused by antibodies to Ach receptors in the post junctional membrane of neuromuscular junction Ref Harrison20th edition pg 2445', 'role': 'assistant'}]