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: Unknown
Which of the following Vitamins is being used in Optic Neuritis? 
Select and explain. 
A. Vitamin A, B. Vitamin B, C. Vitamin D, D. Vitamin C
D: Vitamin C
Answer: D: Vitamin C 
Explanation: Ans. is 'd' i.e.,Vitamin C o Intravenous administration of vitamin C can be evaluated as the method of choice for the treatment of patients with ON.