question: Q:A 67-year-old man with a past medical history of poorly-controlled type 2 diabetes mellitus (T2DM) is brought to the emergency department for acute onset nausea and vomiting. According to the patient, he suddenly experienced vertigo and began vomiting 3 hours ago while watching TV. He reports hiking in New Hampshire with his wife 2 days ago. Past medical history is significant for a myocardial infarction (MI) that was treated with cardiac stenting, T2DM, and hypertension. Medications include lisinopril, aspirin, atorvastatin, warfarin, and insulin. Physical examination demonstrates left-sided facial droop and decreased pinprick sensation at the right arm and leg. What is the most likely etiology of this patient’s symptoms?? 
  {'A': 'Early disseminated Lyme disease', 'B': 'Embolic stroke at the posterior inferior cerebellar artery (PICA)', 'C': 'Hypoperfusion of the anterior spinal artery (ASA)', 'D': 'Labryrinthitis', 'E': 'Thrombotic stroke at the anterior inferior cerebellar artery (AICA)'},