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: Pharmacology
[{'content': 'Which of the following β - blocker has membrane stabilizing action \nSelect and explain. \nA. Nadalol, B. Atenolol, C. Propanalol, D. Nebivalol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: β blockers with membrane stabilizing effect: Carvedilol, Betaxolol, Labetalol, Acebutalol, Metaprolol, Propanolol.\nInfact Propanalol has the maximum membrane stabilizing property.', 'role': 'assistant'}]