A 65-year-old woman with a history of TIA presents with new-onset right-sided weakness and slurred speech 40 minutes ago. On arrival, her symptoms have completely resolved. CT brain is normal. What is the MOST appropriate next step?ADischarge with reassurance and no further workupBAdmit for urgent stroke risk stratification and secondary prevention including antiplatelet and risk factor controlCStart warfarin empirically for presumed cardioembolic sourceDDelay antiplatelet therapy until MRI is availableEGive thrombolysis because onset was within 4.5 hoursCheck my answer