A 70-year-old male patient with erectile dysfunction (ED) has been unable to produce an erection that is adequate to perform sexual intercourse. The patient has a history of diabetes and hypertension that are controlled with medication. He smokes 1 pack per day and drinks 5 standard drinks daily. Which of the following statements about the treatment options for ED is true? A. Phosphodiesterase type 5 inhibitors may cause hypertension B. Phosphodiesterase type 5 inhibitors are contraindicated with concomitant nitrates C. Levitra is the longest-lasting FDA approved phosphodiesterase type 5 inhibitor approved for erectile dysfunction D. Patients with spontaneous morning erections usually have a medication-related cause of erectile dysfunction