This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Thin filament is mainly composed of \nSelect and explain. \nA. Actin, B. Myosin, C. Tropomyosin, D. Dystrophin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The thick filaments are made of myosin molecules. The thin molecules are made of actin.(Ref: Textbook of physiology N Geetha 2nd edition page no.38)', 'role': 'assistant'}]