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
Which of the following drugs is not used in treatment of multiple sclerosis 
Select and explain. 
A. Natalizumab, B. Omalizumab, C. Ocrelizumab, D. Fingolimod
B: Omalizumab
Answer: B: Omalizumab 
Explanation: Omalizumab is used in treatment of asthma.