A nurse is evaluating teaching a client who has a new prescription for montelukast to treat asthma. Which of the following statements by the client indicates an understanding of the teaching?

The correct answer is D: "I'll take this medication once a day in the evening." This demonstrates understanding because montelukast is typically taken once daily in the evening to help control asthma symptoms. Rinsing the mouth after taking the medication (A) is important for inhaled corticosteroids, not montelukast. Taking the medication only during an asthma attack (B) is not the correct way to use montelukast, as it is a maintenance medication. Using a spacer device (C) is more relevant for inhaled corticosteroids or bronchodilators, not montelukast. Therefore, option D is the best choice as it aligns with the prescribed regimen for montelukast.