This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, 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: * Initial Symptoms and percent of cases Sensory loss -37% Optic neuritis- 36% Weakness -35% Ataxia-11%. Optic nerve Pain and temporary vision loss in one eye are common symptoms of optic neuritis. Optic neuritis is linked to multiple sclerosis (MS), a disease that causes inflammation and damage to nerves in your brain and spinal cord Ref Davidson edition23rd pg1110