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': 'Protein-specific for smooth muscle contraction is \nSelect and explain. \nA. Troponin, B. Tropomyosin, C. Myosin, D. Calmodulin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Calmodulin is the calcium binding protein in the smooth muscle. It is similar to troponin C of Skeletal muscle.(REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 59)', 'role': 'assistant'}]