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: Physiology
[{'content': 'Tropomyosin \nSelect and explain. \nA. Helps in the fusion of actin and myosin, B. Prevents attachment of actin and myosin, C. Slides over myosin, D. Causes Ca2+ release', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The active site of actin in skeletal muscles is where myosin binds. This is covered by Tropomyosin.', 'role': 'assistant'}]