question: Q:Which of the following is most likely to have prevented this patient's condition?? 
  {'A': 'High-fiber diet', 'B': 'Long-term use of aspirin', 'C': 'Anticoagulation with warfarin', 'D': 'Different antibiotic regimen for bronchitis', 'E': 'Sitz baths and nifedipine suppositories'},