Which of the following is an inhaled corticosteroid?

Ciclesonide is an inhaled corticosteroid that is commonly used to manage asthma and chronic obstructive pulmonary disease (COPD). As an inhaled corticosteroid, it works by reducing inflammation in the airways, thereby helping to improve airflow and reduce symptoms associated with respiratory conditions.

In contrast, the other options do not fall into the category of inhaled corticosteroids. Albuterol and levalbuterol are both bronchodilators, specifically beta-agonists that provide quick relief by relaxing the muscles around the airways to alleviate symptoms of asthma or COPD. Prednisone, on the other hand, is an oral corticosteroid that is used to treat inflammation but is not inhaled. It is typically prescribed for short-term management of severe symptoms rather than for long-term control as inhaled corticosteroids are.

Thus, ciclesonide is identified as the correct choice due to its specific function as an inhaled corticosteroid that directly targets airway inflammation.