This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Drug used in multiple sclerosis \nSelect and explain. \nA. Inferferon alpha, B. Interferon beta, C. Interferon gamma, D. Infliximab -', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *beta interferon have a modest effect on exacerbrations and disease progression in relapsing-remitting MS. Ref Harrison20th edition pg 2456', 'role': 'assistant'}]