Which Are Contraindications for Taking Sildenafil [Viagra]

Multiple Choice

Which are contraindications for taking sildenafil [Viagra]?

A) Patients who are taking nitroglycerin for angina pectoris
B) Patients with nonarteritic ischemic optic neuropathy (NAION) in one eye
C) Patients with BPH who are taking alpha₁-adrenergic antagonists
D) Patients with a blood pressure of 100/60 mm Hg
E) Patients with a history of myocardial infarction (MI) in the past 6 months