This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
Drug showing additional nitric oxide activity: 
Select and explain. 
A. Atenolol, B. Metoprolol, C. Bisoprolol, D. Nebivolol
D: Nebivolol
Answer: D: Nebivolol 
Explanation: Ans. D. NebivololAll the drug mentioned are selective beta 1 blockers. Out of all nebivolol has additional nitric oxide activity which increase the level of cGMP and thus causing vasodilation.