Salmeterol is commonly used to treat which of the following conditions?

Salmeterol is a long-acting beta-2 adrenergic agonist that is primarily used in the management of respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). It works by relaxing the muscles in the airways, which helps to improve airflow and ease breathing. This makes it particularly effective for individuals who experience chronic symptoms associated with asthma or COPD, where prolonged control of bronchospasm is necessary.

The other conditions listed are typically managed through different classes of medications. For example, diabetes is primarily treated with insulin or other antidiabetic agents, while hypothyroidism requires thyroid hormone replacement. High cholesterol management usually involves statins or other lipid-lowering medications. Therefore, salmeterol's specific action on the respiratory system makes it the appropriate choice for treating asthma and COPD.