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
Omalizumab is administered by which route: 
Select and explain. 
A. Inhalation, B. Intravenous, C. Intranasal, D. Subcutaneous
D: Subcutaneous
Answer: D: Subcutaneous 
Explanation: Patients should be given a 3-4 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. Ref: Harrison's principle of internal medicine 17th edition, chapter 248.