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: Biochemistry
[{'content': 'Kinases require: \nSelect and explain. \nA. Mn2+, B. Cu2+, C. Mg2, D. Inorganic phosphate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mg2', 'role': 'assistant'}]