<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 78-year-old man is brought in to the emergency department by ambulance after his wife noticed that he began slurring his speech and had developed facial asymmetry during dinner approximately 30 minutes ago. His past medical history is remarkable for hypertension and diabetes. His temperature is 99.1F 37.3C, blood pressure is 15499 mmHg, pulse is 89min, respirations are 12min, and oxygen saturation is 98 on room air. Neurologic exam reveals right upper and lower extremity weakness and an asymmetric smile. Which of the following is the next best step in management?? A: Alteplase, B: Aspirin, C: CT head, D: CTA head, E: MRI brain,  <response>: This is a clinical vignette describing a 78-year-old man with acute onset of slurred speech and facial asymmetry, concerning for an acute ischemic stroke. The key findings are the acute neurological deficits localized to the right side of his body, indicating a stroke in the left hemisphere of his brain. The next best step in management is to obtain emergent neuroimaging to determine if he is having an ischemic stroke and if so, assess candidacy for intravenous thrombolysis with alteplase. CT head without contrast is the preferred initial study as it can quickly and accurately identify early signs of ischemic stroke. CTA head provides additional visualization of the cerebral vasculature. MRI brain, while more sensitive, takes longer to obtain and is not necessary for initial diagnosis. Aspirin is not indicated prior to neuroimaging, as it can limit treatment options if thrombolysis is warranted.C: CT head 