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
[{'content': 'Which of the following is a beta blocker with beta 2 receptor agonist action? \nSelect and explain. \nA. Labetalol, B. Carvedilol, C. Celiprolol, D. Tilisolol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Celiprolol is a selective beta1 blocker having additional weak beta 2 agonistic activity which reduces vascular resistance and is safe in asthmatics. Labetolol is an alpha and beta blocker. Carvedilol is a beta 1, beta 2 and alpha 1 adrenoreceptor blocker. Ref: Essentials of Medical Pharmacology By K D Tripathi, 5th edn, Page 131', 'role': 'assistant'}]