A 50-year-old wom an cam e to her physician com plaining of dizziness and vertigo for the past 3 days. The wom an was recently diagnosed w ith hypertension and diastolic dysfunction and had started a hypertensive therapy 1 week earlier. Physical exam ination showed supine blood pressure of 166/94 m m Hg and standing blood pressure of 140/83 m m Hg. Which of the follow ing antihypertensive drugs was the patient m ost likely taking? A. Propranolol B. Clonidine C. Captopril D. Hydrochlorothiazide E. Labetalol