Which of the following inhaled corticosteroids is used for asthma treatment?

Pulmicort is an inhaled corticosteroid that is specifically used in the management of asthma. It contains the active ingredient budesonide, which helps to reduce inflammation in the airways, making it easier for individuals with asthma to breathe. The primary role of inhaled corticosteroids like Pulmicort is to control and prevent asthma symptoms by minimizing inflammation and mucus production within the airways over time.

The other medications listed, such as Seretide and Symbicort, are combinations that contain inhaled corticosteroids alongside long-acting bronchodilators for broader management of asthma and chronic obstructive pulmonary disease (COPD). Rexair, on the other hand, is not a medication for asthma treatment; instead, it refers to a brand of air purifiers and does not have relevance in this context. This distinction highlights how Pulmicort is specifically designed as an inhaled corticosteroid to target the underlying inflammation associated with asthma.