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
[{'content': 'Which of the following drugs is not used in treatment of multiple sclerosis \nSelect and explain. \nA. Natalizumab, B. Omalizumab, C. Ocrelizumab, D. Fingolimod', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Omalizumab is used in treatment of asthma.', 'role': 'assistant'}]