This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
[{'content': 'True regarding Na+ ion \nSelect and explain. \nA. Responsible for Donnan effect, B. Responsible for resting membrane potential, C. Responsible for depolarization, D. Dose not help other ions in transport', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Responsible for depolarization(Ref: Guyton, 13th ed/p.65)Option a - Sodium ion is not Responsible for Donnan effect. This effect is due to non-diffusible anions like proteinsOption b - potassium ion is responsible for RMPOption d - many substances require sodium for their transport through secondary active transport processes', 'role': 'assistant'}]