This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs, Subject name: Medicine
[{'content': 'Bulls eye retinopathy is seen in toxicity of: (Repeat) \nSelect and explain. \nA. Chloroquine, B. Mefloquine, C. Primaquine, D. Quinine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans A (Chloroquine) Ref: CMDT, 2013. pg 197Explanation:Adverse Effects of ChloroquineOcular- Irreversible retinal damage,CNS- Seizures. Tinnitus, Nerve deafnessGIT- Anorexia, nausea, vomitingSkin pigmentation', 'role': 'assistant'}]