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
All of the following can cause Optic Neuritis,except - 
Select and explain. 
A. Rifampicin, B. Digoxin, C. Chloroquine, D. Ethambutol
A: Rifampicin
Answer: A: Rifampicin 
Explanation: Important drugs causing optic neuritis are quinine, chloroquine, ethambutal, isoniazid(INH), Streptomycin, Digoxin, Amiodarone, NSAIDs (aspirin, indomethacin, phenylbutazone, ibuprofen), vigabatrine, disulfiram.