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: Pharmacology
Optic neuritis is a side effect of: 
Select and explain. 
A. Rifampicin, B. INH, C. Pyrazinamide, D. Ethambutol
D: Ethambutol
Answer: D: Ethambutol 
Explanation: None