<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 62-year-old woman with a history of subarachnoid hemorrhage is brought to the emergency department because of shortness of breath and sharp chest pain that worsens on inspiration. She underwent surgery for a hip fracture 3 weeks ago. Her pulse is 110min, respirations are 20min, and blood pressure is 11274 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 92. The lungs are clear to auscultation and there is no jugular venous distention. A ventilation and perfusion scan shows a small perfusion defect in the left lower lung. A drug with which of the following mechanisms of action is most appropriate for this patient?? A: Inhibition of vitamin K epoxide reductase, B: Inhibition of cyclooxygenase, C: Inhibition of adenosine diphosphate receptors, D: Activation of plasminogen, E: Activation of antithrombin III,  <response>: This is a clinical vignette describing a 62-year-old woman with a history of subarachnoid hemorrhage who now presents with shortness of breath and chest pain worsened by inspiration. She recently underwent hip surgery. Her vital signs show tachycardia and mild hypoxemia. Her lung exam is clear and there is no evidence of heart failure. A VQ scan shows a small perfusion defect suggestive of a pulmonary embolism. Based on the clinical presentation and test results, this patient likely has a pulmonary embolism. The question is asking for a drug with a mechanism of action appropriate for treating a pulmonary embolism. A pulmonary embolism is a blood clot in the pulmonary arteries, so an anticoagulant medication is needed.E: Activation of antithrombin III 