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': 'Equilibrium potential for an ion is calculated using: \nSelect and explain. \nA. Gibbs-Donnan equation, B. Nerst equation, C. Goldman equation, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Nernst equation Equilibrium potential (i.e., membrane potential at which equilibrium b/w concentration & electrical gradient exist) for any (one) univalent ion is calculated by Nernst equationQ and for several different ions by Goldmann- Hodgkin-katz equation.', 'role': 'assistant'}]