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 regarding Na+ ion - \nSelect and explain. \nA. Responsible for Donnan effect, B. Responsible for Resting membrane potential, C. Responsible for Depolarization, D. Does not help other ions in transport', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Depolarization occurs due to sodium ions influx.\nPotassium ions maintain the resting membrane potential.\nSodium ions are not responsible for Gibbs-Donnan effect. It is due to the non-diffusible anions.\nSodium ions take part in many co-transports.', 'role': 'assistant'}]