Which disease-modifying therapy for multiple sclerosis (MS) requires REMS program enrollment due to risks of progressive multifocal leukoencephalopathy (PML)?
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A
Interferon beta-1a (Avonex)
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B
Natalizumab (Tysabri)
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C
Glatiramer acetate (Copaxone)
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D
Dimethyl fumarate (Tecfidera)