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
Timolol can produce which of the following effect in an asthmatic patient? 
Select and explain. 
A. Bronchodilation, B. Bronchospasm, C. Decreased bronchial secretions, D. Increased bronchial secretions
B: Bronchospasm
Answer: B: Bronchospasm 
Explanation: 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.