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': '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: Na+-K+ATPase, which actively moves Na+and K+ against their electrochemical gradient. The electrogenic Na K ATPase plays a critical role in cellular physiology by using the energy in ATP to extrude 3 Na+ out of the cell in exchange for taking two K+ into the cell. (REF.GANONG'S REVIEW OF MEDICAL PHYSIOLOGY 23rd EDITION page no.85.)", 'role': 'assistant'}]