question: Q:A 70-year-old man presented to the emergency department complaining of left-sided weakness for the past 5 hours. Past medical history is significant for a previous ischemic stroke involving the right posterior cerebral artery and left-sided homonymous hemianopia. He also has a history of type-II diabetes mellitus and hypertension. He takes an 81 mg aspirin, amlodipine, atorvastatin, and a vitamin supplement with calcium and vitamin D. A brain MRI reveals a small atrophic area of the left occipital lobe and a new acute infarct involving the territory of the right middle cerebral artery. Electrocardiogram (ECG) shows normal sinus rhythm. An echocardiogram reveals mild left ventricular hypertrophy with an ejection fraction of 55%. Doppler ultrasound of the carotid arteries reveals no significant narrowing. What is the next step in the management to prevent future risks of stroke?? 
  {'A': 'Add dipyridamole', 'B': 'Add warfarin', 'C': 'Increase aspirin to 325 mg', 'D': 'Administer tPA', 'E': 'Stop aspirin and start warfarin'},