This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
[{'content': 'Which anti-glaucoma drug causes black deposits in conjunctiva? \nSelect and explain. \nA. Alpha blocker, B. PG analogue, C. Adrenaline, D. CA inhibitor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Adrenochrome deposits occur due to alpha agonists on conjunctiva. PG analogues cause hyperpigmentation. Adrenaline/Epinephrine causes black deposits in conjunctiva.', 'role': 'assistant'}]