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': 'The repolarization phase of an action potential is due to \nSelect and explain. \nA. Increasing sodium permability and increasing potassium permeability, B. Increasing sodium permeability and decreasing potassium permeability, C. Decreasing sodium permeability and an immediate increasing potassium permeability, D. Decreasing sodium permeability and a delayed increase potassium permeability', 'role': 'user'}, {'content': 'Answer: D \nExplanation: There is a decrease in sodium permeability (inactivation of the sodium channels) and a delayed increased in potassium permeability during the repolarization phase of the action potential. The pump plays no direct role in the action potential.', 'role': 'assistant'}]