A nurse is caring for a child who has cystic fibrosis and is taking dornase alfa. Which of the following actions should the nurse take to evaluate the effectiveness of the medication?

Choice A reason: Determining the child's heart rate is important for assessing overall cardiovascular health, but it is not specific to evaluating the effectiveness of dornase alfa. Choice B reason: Weighing the child daily is important for monitoring overall nutritional status and fluid balance, but it is not specific to evaluating the effectiveness of dornase alfa. Choice C reason: Dornase alfa is a medication used to help clear mucus from the airways in individuals with cystic fibrosis. Therefore, auscultating the child's breath sounds for improved air exchange and reduced adventitious lung sounds is a direct way to evaluate the effectiveness of the medication. Choice D reason: Monitoring the child's 180 (assuming this is a typo and referring to heart rate) is important, but it is not specific to evaluating the effectiveness of dornase alfa.