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 anti - glaucoma drug can likely cause black pigmentation on conjunctiva \nSelect and explain. \nA. Adrenaline, B. Latanoprost, C. Beta blockers, D. Pilocarpine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Adrenaline used in glaucoma can lead to conjunctival pigmentation because of adrenochrome.', 'role': 'assistant'}]