This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro-Ophthalmology, Subject name: Ophthalmology
[{'content': 'All of the following can cause Optic Neuritis, except- \nSelect and explain. \nA. Rifampicin, B. Digoxin, C. Chloroquine, D. Ethambutol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) RifampicinRef Kanski 5/e, p. 601, 603Important drugs causing optic neuritis are quinine, chloroquine, ethambutol, isoniazid (INH), Streptomycin, Digoxin, Amoidarone, NSAIDs (aspirin, indomethacin, phenylbutazone, ibuprofen), vigabatrine, disulfiram).', 'role': 'assistant'}]