This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sympathetic System, Subject name: Pharmacology
[{'content': 'Which of the following beta blocker has additional vasodilator action? \nSelect and explain. \nA. Atenolol, B. Metoprolol, C. Propranolol, D. Carvedilol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Carvedilol has additional vasodilatory action due to its alpha blocking propey. These are called third generation beta blockers. Third-Generation Beta-Blockers - a blockade (labetalol, carvedilol), - b2 agonism (celiprolol, caeolol, bopindolol), - Release of NO (nebivolol, nipradilol), - Opening of K+ channels (tilisolol) - Inhibition of Ca2+ channels (carvedilol, bevantolol, betaxolol).', 'role': 'assistant'}]