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 magnitude of an electrical difference that exists across the membrane can be determined by \nSelect and explain. \nA. Gibbs-Donnan equation, B. Henderson-Hasselbalch equation, C. Nernst equation, D. Fick's law", 'role': 'user'}, {'content': 'Answer: C \nExplanation: In electrochemistry, the Nernst equation is an equation that relates the reduction potential of an electrochemical reaction (half-cell or full cell reaction) to the standard electrode potential, temperature, and activities (often approximated by concentrations) of the chemical species undergoing reduction and oxidation Ref: guyton and hall textbook of medical physiology 12 edition page number:58,59,60', 'role': 'assistant'}]