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: Pharmacology
[{'content': 'Drug of choice for relapsing-remitting multiple sclerosis is: \nSelect and explain. \nA. α IFN, B. β IFN, C. γ IFN, D. Natalizumab', 'role': 'user'}, {'content': 'Answer: B \nExplanation: For acute attacks: Methylprednisolone pulse therapy.\nFor reducing recurrences in relapsing-remitting MS: IFN-beta and glatiramer.\nFor resistant cases: Natalizumab.', 'role': 'assistant'}]