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: Medicine
Drug used in multiple sclerosis - 
Select and explain. 
A. Inferferon alpha, B. Interferon beta, C. Interferon gamma, D. Infliximab
B: Interferon beta
Answer: B: Interferon beta 
Explanation: None