This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Adrenergic System, Subject name: Pharmacology
Drug with membrane stabilizing activity is? 
Select and explain. 
A. Nadolol, B. Atenolol, C. Carvedilol, D. Oxprenolol
D: Oxprenolol
Answer: D: Oxprenolol 
Explanation: ANSWER: (D) OxprenololREF: KDT 6 th edition page 140Membrane stabilizing activity (in propanolol, oxprenolol, acebutolol). This activity is claimed to contribute to the antiarrhythmic action, but appears to be significant only at high doses