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': 'Troponin-C mimics which of the following? \nSelect and explain. \nA. Calmodulin, B. Calcineurin, C. Calretinin, D. Ceruloplasmin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Troponin C contains binding site for Ca2+ that initiates muscle contraction.(Ref: Textbook of physiology AK Jain 5th edition page no.164)', 'role': 'assistant'}]