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: Unknown
[{'content': 'Sarcomeresare the fundamental contractile unit of skeletal muscle and are characterized by their highly ordered appearance under a polarizing light microscope\nThick filaments in the A bandare composed primarily of the protein myosin.\n\nEach myosin moleculeis composed of \nSelect and explain. \nA. Two monomers, B. Four monomers, C. Six monomers, D. Seven monomers', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sarcomeresare the fundamental contractile unit of skeletal muscle and are characterized by their highly ordered appearance under a polarizing light microscope\nThick filaments\nThick filaments in the A band are composed primarily of the protein myosin. Each myosin molecule is composed of six monomers: two protein strands intertwined in a helical arrangement (termed heavy chains) and four smaller, globular proteins (termed myosin light chains).\nThin filaments\nThin filaments are composed of three primary proteins: actin, tropomyosin, and troponin', 'role': 'assistant'}]