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
[{'content': 'Most common presenting finding of multiple sclerosis is - \nSelect and explain. \nA. Intranuclear ophthalmoplegia, B. Optic neuritis, C. Transverse myelitis, D. Cerebellar ataxia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]