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: Ophthalmology
[{'content': 'Which of the following is not used in glaucoma in a hypertensive patient – \nSelect and explain. \nA. Dipivefrine, B. β–blockers, C. Alpha agonist, D. Trabeculoplasty', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Alpha agonists (Brimonidine and apraclonidine) are contraindicated in hypertensive crisis.\nDipivefrin is a prodrug which is converted into epinephrine inside the eyeball, so can safely be used in hypertension.', 'role': 'assistant'}]