A nurse is reviewing the medication record of a client who has heart failure and has a potassium level of 2.4 mEq/L. The nurse should identify which of the following medications as a possible cause of the client's potassium level?.

Choice A rationale: Furosemide is a diuretic that can cause your blood level of potassium to decrease, which is known as hypokalemia. Therefore, this statement is correct. Choice B rationale: Spironolactone is a potassium-sparing diuretic which conserves potassium, thereby balancing its levels in the body. Therefore, this statement is incorrect. Choice C rationale: Metoprolol does not significantly affect potassium levels. Therefore, this statement is incorrect. Choice D rationale: Nitroglycerin does not significantly affect potassium levels. Therefore, this statement is incorrect.