β blocker with intrinsic sympathomimetic activity: (A) Propanalol, (B) Carvedilol, (C) Acebutolol, (D) Atenolol
Answer is C. β blockers with intrinsic sympathomimetic activity have partial agonistic action on β1 receptors thus causing lesser bradycardia.
Ex: Acebutalol, Celiprolol, Cartelol, Pindolol, Penbutolol, Labetalol.