A 9-year-old boy is brought by his parents for concerns about inattention and hyperactivity at school and home. According to Canadian ADHD guidelines, what is the most appropriate initial step in management?AStart stimulant medication immediately without further assessmentBConduct a comprehensive assessment using DSM-5 criteria with information from parents and schoolCOrder brain MRI to exclude structural lesionsDDiagnose ADHD based solely on teacher reportETrial of antidepressant medicationCheck my answer