This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Myosin is attached to m line by \nSelect and explain. \nA. Myomesin, B. Alfa actinin, C. Titin, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: M line is present at the center of h zone Myosin is attached to m line by myomesin Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 86,87', 'role': 'assistant'}]