question: Q:A 54-year-old man with a long-standing history of chronic obstructive pulmonary disease (COPD) presents to the clinic for progressive shortness of breath. The patient reports generalized fatigue, distress, and difficulty breathing that is exacerbated with exertion. Physical examination demonstrates clubbing of the fingers, and an echocardiogram shows right ventricular hypertrophy. The patient is placed on a medication for symptom control. One month later, the patient returns for follow up with some improvement in symptoms. Laboratory tests are drawn and shown below:
  
  Serum:
  Na+: 137 mEq/L
  Cl-: 101 mEq/L
  K+: 4.8 mEq/L
  HCO3-: 25 mEq/L
  BUN: 8.5 mg/dL
  Glucose: 117 mg/dL
  Creatinine: 1.4 mg/dL
  Thyroid-stimulating hormone: 1.8 µU/mL
  Ca2+: 9.6 mg/dL
  AST: 159 U/L
  ALT: 201 U/L
  
  What is the mechanism of action of the likely medication given?? 
  {'A': 'Beta-2 agonist', 'B': 'Competitive inhibition of endothelin-1 receptors', 'C': 'Competitive inhibition of muscarinic receptors', 'D': 'Inhibition of phosphodiesterase-5', 'E': 'Prostacylin with direct vasodilatory effects'},