question: Q:A 54-year-old male presents to clinic complaining that he is not sleeping well because he has to get up from bed to urinate multiple times throughout the night. He says that he strains to void, has terminal dribbling, and has urinary urgency. Past medical history is significant for orthostatic hypotension. On digital rectal exam, you note symmetric firm enlargement of the prostate. Free Prostate-Specific-Antigen (PSA) level is 4.6 ng/mL. Before you finish your physical exam, the patient asks if there is anything you can do for his male-pattern baldness. What is the mechanism of action of the drug that would pharmacologically treat this patient’s urinary issues and his male-pattern baldness?? 
  {'A': 'Phosphodiesterase-5 inhibition', 'B': 'Alpha-1 blockade', 'C': 'Squalene epoxidase inhibition', 'D': '5-alpha reductase inhibition', 'E': '17,20-desmolase inhibition'},