This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'Antibody in asthma treatment - \nSelect and explain. \nA. Omalizumab, B. Rituximab, C. Transtusuzumab, D. Daclizumab', 'role': 'user'}, {'content': "Answer: A \nExplanation: Omalizumab is a blocking antibody that neutralises circulating IgE without binding to cell-bound IgE ,and ,thus inhibits IgE mediated reactions in asthma.Patients should be given a 3 to 4 month trial of therapy to show objective benefit.Omalizumab is usually given as a subcutaneous injection every 2-4 weeks and appears not to have significant side effects,although anaphylaxis is very occasionally seen. Reference:Harrison's medicine-18th edition,page no:2112.", 'role': 'assistant'}]