This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Which is beta antagonist? 
Select and explain. 
A. Salbutamol, B. Propanolol, C. Salmeterol, D. Albuterol
B: Propanolol
Answer: B: Propanolol 
Explanation: Ref:KD Tripathi pharmacology 7th edition (page.no: 144) classification of b blockers : Nonselective (b 1 and b 2 ) a.Without intrinsic sympathomimetic activity; Propranolol, Sotalol, Timolol. b.With intrinsic sympathomimetic activity ; Pindolol c.With additional a blocking propey ; Labetalol, Carvedilol Cardioselective ( b1 ) Metoprolol, Atenolol, Acebutolol, Bisoprolol; Esmolol, Betaxolol, Celiprolol, Nebivolol beta -2-agonists- Salmeterol, Salbutamol