This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
Which of the following is the most common initial presenting feature of multiple sclerosis: 
Select and explain. 
A. Optic Neuritis, B. Cerebellar Ataxia, C. Internuclear ophthalmoplegia, D. Diplopia
A: Optic Neuritis
Answer: A: Optic Neuritis 
Explanation: Optic Neuritis is the most frequent initial presenting feature of MS amongst the options provided. The most common earliest presenting features of multiple sclerosis are transient sensory defects followed by visual disturbances due to optic neuritis REF: Harrison book of internal medicine 21ST EDITION