This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Psychiatry
[{'content': 'A psychiatric patient on regular treatment had his routine check-up. His fundus shows the below finding. The most probable drug implicated is ( Pigmented retinal epithelium) \nSelect and explain. \nA. Thioridazone, B. Haloperidol, C. Chlorpromazine, D. Clozapine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Irreversible retinal pigmentation is associated with the use of thioridazine at dosages above 1000mg/day(hence <800/day ) nocturnal confusion is an early sign of this adverse effect. Reference: P.3121 chap. 31.17First-Generation Antipsychotics (Kaplan & Sadock's Comprehensive Textbook of Psychiatry, 9th Edition)", 'role': 'assistant'}]