This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following β-blocker is safe in asthma 
Select and explain. 
A. Celiprolol, B. Timolol, C. Carveidilol, D. Labetalol
A: Celiprolol
Answer: A: Celiprolol 
Explanation: Celiprolol is a selective β1 blocker (cardioselective), has no action on β2 receptors present on bronchial smooth muscle. Hence it is safe in asthma.