A 27-year-old man has a first unprovoked generalised tonic-clonic seizure. He returns to baseline after several hours. CT head and basic blood work in the emergency department are normal. What is the most appropriate next diagnostic step?ANo further investigation is required; reassure and discharge.BOrder an EEG and brain MRI to further evaluate for a structural or epileptogenic cause.CStart long-term antiepileptic medication without further testing.DSchedule carotid Doppler ultrasound as first-line imaging.EPerform lumbar puncture routinely in all first seizures.Check my answer