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': 'Most distinguishing feature between skeletal muscle and smooth muscle \nSelect and explain. \nA. Troponin, B. Tropomyosin, C. Myosin, D. Actin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Troponin is the calcium binding protein in the Skeletal muscle. In smooth muscle, calmodulin is the calcium binding protein. (REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 40,59)', 'role': 'assistant'}]