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': 'All are major calcium binding proteins except \nSelect and explain. \nA. Troponin, B. Calmodulin, C. Actinin, D. Calcineurium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Troponin helps in contraction of muscle .calmodulin helps in activalting enzymes and calcinuerium helps in inactivation of calcium channels', 'role': 'assistant'}]