Final answer:
The patient indicates understanding of aliskiren [Tekturna] by choosing the option that states the medication should be taken 1 hour before a meal to enhance its absorption.
Step-by-step explanation:
The correct answer to the question of what indicates understanding of the medication teaching for a female patient prescribed aliskiren [Tekturna], a direct renin inhibitor (DRI), is option d: "I should take this medication 1 hour before sitting down to a meal." This response demonstrates the patient's understanding that aliskiren should be taken on an empty stomach to enhance absorption. Taking aliskiren with a high-fat meal can decrease its effectiveness, so option b is incorrect. Aliskiren is a direct renin inhibitor, not a diuretic or potassium-sparing agent, thus options a and c are also incorrect statements and do not show an understanding of the medication.