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': 'The difference between skeletal and smooth muscle contraction and relaxation is/area) Troponin (+ve)b) Myosin light chain kinasec) Ca2+d) Actine) Myosin \nSelect and explain. \nA. ac, B. a, C. ab, D. bc', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Troponin is absent in case of smooth muscles but present in skeletal muscles.\n\xa0\nMyosin light chain kinase is involved in case of smooth muscle contraction, but not in skeletal muscles.', 'role': 'assistant'}]