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: Medicine
Earliest feature in Multiple sclerosis is - 
Select and explain. 
A. Optic neuritis, B. Inter nuclear ophthalmologia, C. Ataxia, D. Weakness
A: Optic neuritis
Answer: A: Optic neuritis 
Explanation: None