A 59-year-old man presents 90 minutes after onset of right hemiparesis and aphasia. CT brain shows no haemorrhage, and there are no contraindications to thrombolysis. What is the most appropriate intervention?AOffer intravenous alteplase as he is within the 4.5-hour treatment windowBWithhold thrombolysis because CT is normalCWait to see if deficits improve spontaneouslyDStart aspirin only and observe for 24 hoursEDefer treatment until MRI confirms infarctCheck my answer