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
[{'content': 'Which of the following is the most common initial presenting feature of multiple sclerosis: \nSelect and explain. \nA. Optic Neuritis, B. Cerebellar Ataxia, C. Internuclear ophthalmoplegia, D. Diplopia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]