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': 'All of the following proteins are involved during contraction of muscles, EXCEPT: \nSelect and explain. \nA. Myosin, B. Actin, C. Myoglobin, D. Troponin', 'role': 'user'}, {'content': "Answer: C \nExplanation: The contractile mechanism in skeletal muscle largely depends on the proteins, Myosin-II Actin Tropomyosin Troponin Troponin is made up of three subunits: troponin I, troponin T, and troponin C. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. (2012). Chapter 5. Excitable Tissue: Muscle. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks (Eds), Ganong's Review of Medical Physiology, 24e.", 'role': 'assistant'}]