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': 'Active transpo across the cell membrane is mediated by : \nSelect and explain. \nA. G-proteins, B. Na+-K+ ATPase, C. Carrier protein, D. Channel protein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Carrier protein', 'role': 'assistant'}]