A 68-year-old man presents with sudden right-sided weakness and aphasia that began 45 minutes ago. On examination he is conscious but has dense hemiparesis. What is the most appropriate immediate investigation?AUrgent non-contrast CT scan of the headBMRI brain within 24 hoursCCarotid Doppler ultrasound before imaging the brainDEchocardiography as first-lineEOutpatient CT scan within 2 weeksCheck my answer