What drug is used for the chronic management of bronchospasm in asthma?

Tiotropium is the correct choice for chronic management of bronchospasm in asthma. It is a long-acting anticholinergic agent that works by blocking acetylcholine at muscarinic receptors in the airway, leading to bronchodilation. This effect is particularly beneficial for individuals with chronic obstructive pulmonary disease (COPD) and asthma, as it helps to reduce airway resistance and improves airflow. Tiotropium is taken once daily, making it an effective option for long-term control of symptoms and improving pulmonary function.

Ipratropium, while also an anticholinergic, is a short-acting agent typically used for acute situations rather than chronic management. Scopolamine and atropine have different primary uses, such as motion sickness and bradycardia, respectively, and are not indicated for asthma management. Thus, tiotropium stands out as the preferred option for managing chronic bronchospasm.