This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sympathetic System, Subject name: Pharmacology
[{'content': 'Timolol can produce which of the following effect in an asthmatic patient? \nSelect and explain. \nA. Bronchodilation, B. Bronchospasm, C. Decreased bronchial secretions, D. Increased bronchial secretions', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Timolol is a non-selective Beta blocker (1st generation) It is used for treatement of primary open angle glaucoma. It can cause bronchoconstriction (by blocking beta 2 receptors) paicularly in asthmatics.', 'role': 'assistant'}]