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': "Bull's eye retinopathy is seen with \nSelect and explain. \nA. Chloroquine, B. Methanol, C. Ethambutol, D. Steroids", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]