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': 'The regulator proteins are \nSelect and explain. \nA. Troponin, B. Tropomyosine, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Both troponin and tropomyosine are the regulator proteins for muscle contraction Ref:Guyton and Hall textbook of medical physiology 12th edition ,pag number:86,87', 'role': 'assistant'}]