[Expert Solution]: A 55-year-old man is complaining of…

A 55-year-old man is complaining of difficulty with having an erection. He explains he has erections sometimes at night or when he wakes up, and it has been a problem for about 6 months. He is married and denies any relational problems other than being tired often and not in the mood to engage in sexual intercourse. He has a history of hypertension and is taking an angiotensin-converting enzyme. He smokes 1 pack of cigarettes per day for 25 years. Initial diagnostic testing will include: Option A penile ultrasound. Option B serum glucose testing, a lipid profile, and thyroid profile. Option C serum sex-binding hormone globulin and prolactin. Option D cavernosography.