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': 'Na+ – K+ ATPase \nSelect and explain. \nA. 3 Na+ out/ 2K+ in, B. 3Na+ in/ 2K+ out, C. 2Na+ out/ 3K+ in, D. 2Na+ in/3K+ out', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In Na+-K+ exchange, 3 Na goes out and 2K goes in to the cell.', 'role': 'assistant'}]