<qa>  What is the name of the exacerbation history?- Exacerbation history: Previously confirmed history of two or more exacerbations requiring treatment with systemic corticosteroids intramuscular, intravenous, or oral in the 12 months prior to Visit 1 despite the use of high-dose ICS. For subjects receiving omalizumab for 8 months, at least one exacerbation must have occurred while on omalizumab treatment. For subjects receiving maintenance oral corticosteroids, the corticosteroid treatment for the exacerbations must have been a two-fold dose increase or greater. 