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A 35 year old man has a headache , sleepiness, and poor balance that have worsened over the past week. The patient is known to be HIV – seropositive. On examination, his responses are slow and he has some difficulty in sustaining attention. He has right hemiparesis with increased reflexes on the right. Routine cell counts and chemistries are normal. What is the most appropriate next step?

APerform a lumbar puncture
BStart intravenous heparin
CGet a head CT with contrast
DStart antiretroviral therapy
Medicine
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