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 medications is contraindicated in patients with allergy to sulphonamides - \nSelect and explain. \nA. Levobunolol, B. Bimatoprost, C. Brinzolamide, D. Brimonidine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Brinzolamide Acetazolamide, Dorzolamide and Brinzolamide are sulfonamide derivatives which act by inhibiting carbonic anhydrase (carbonic anhydrase inhibitor). Being sulphonamide derivatives they are contraindicated in patients with allergy to sulphonamides.", 'role': 'assistant'}]