A nurse is providing teaching to a client who has a new prescription for theophylline, a sustained-release capsule. Which of the following statements by the client indicates an understanding of the teaching?

C. This statement demonstrates an understanding of the monitoring requirement for theophylline therapy. Blood levels are typically checked to adjust the dosage and ensure that the medication is within the therapeutic range.A. Taking theophylline with coffee is not recommended due to the potential interaction. Therefore, this statement indicates a misunderstanding of the teaching.B. Fluid intake does not need to be restricted while taking theophylline. In fact, adequate hydration is generally recommended unless otherwise specified for other medical reasons.D. Sprinkling theophylline sustained-release capsules in applesauce is not recommended. Clients should take the medication whole, without crushing or altering the capsule, to ensure proper absorption and effectiveness.