A 6-year-old boy presents with behavioural difficulties, inattention and hyperactivity at school. Parents report similar symptoms at home. Which of the following is an essential step before diagnosing attention-deficit/hyperactivity disorder (ADHD)?AStarting a trial of stimulant medication to see if symptoms improveBExcluding epilepsy with EEGCComprehensive assessment including developmental, educational and family history, and obtaining information from both parents and teachersDBrain MRI to exclude structural lesionsEFormal IQ testingCheck my answer