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': 'Site where myosin head bind to actin in skeletal muscle are covered by ________ \nSelect and explain. \nA. Tropomyosin, B. Titin, C. Troponin, D. Tropomodulin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]