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': "Bull's eye lesion seen with: \nSelect and explain. \nA. Chloroquine, B. Dapsone, C. Rifampicin, D. Ethambutol", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Chloroquine', 'role': 'assistant'}]