This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Which of the following drug is a third generation b-blocker? 
Select and explain. 
A. Propanolol, B. Timolol, C. Nadolol, D. Nebivolol
D: Nebivolol
Answer: D: Nebivolol 
Explanation: Ans. D. NebivololThird gen Blockers - B blocker with vasodilator property are useful for hypertension and CHFa. a Blockade- Labetalol, Carvedilolb. b2 Agonist- Celiprololc. Antioxidant- Carvedilold. NO donor- Nebivolole. Ca Channel Blocker- Carvedilolf. K Channel Blocker- Tilosolol