Which of the following medications is indicated for regular use in patients with stable COPD?

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Although the airflow obstruction from emphysema itself is irreversible, most (up to two-thirds) patients with stable COPD will demonstrate a reversible component of airflow obstruction, defined as a 12% and 200-ml rise in the post-bronchodilator FEV₁ and/or FVC. For this reason, as indicated in an algorithm developed by the Global Initiative for Chronic Obstructive Lung Disease (GOLD), bronchodilator therapy is recommended for patients with COPD.

Which of the Following Medications Is Indicated for Regular Use