This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Coupling ratio of sodium potassium pump is: \nSelect and explain. \nA. 3:02, B. 2:03, C. 1:03, D. 3:01', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sodium potassium pump transpos sodium out for 2 potassium molecules in Hence coupling ratio is 3:2', 'role': 'assistant'}]