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': 'True about Na+ - K+ pump is that: \nSelect and explain. \nA. Involves ATPase activity, B. It can move Na+ in and out of cell, C. Electrically neutral, D. Pumps out one Na+ for one K+', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Involves ATPase activity', 'role': 'assistant'}]