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
Drug of choice for relapsing-remitting multiple sclerosis is: 
Select and explain. 
A. α IFN, B. β IFN, C. γ IFN, D. Natalizumab
B: β IFN
Answer: B: β IFN 
Explanation: For acute attacks: Methylprednisolone pulse therapy.
For reducing recurrences in relapsing-remitting MS: IFN-beta and glatiramer.
For resistant cases: Natalizumab.