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: Ophthalmology
[{'content': 'Which treatment in the optic neuritis treatment trial (ONTT) had the highest rate of recurrence \nSelect and explain. \nA. IV methy prednisolone alone, B. Oral prednisone alone, C. IV methyl prednisolone and oral prednisone, D. Observation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oral prednisone alone has high recurrence rate.', 'role': 'assistant'}]