question: Q:A 5-year-old boy is brought in by his mother with reports of trouble at school. Teachers report that for the last 6 months he has been having difficulty finishing tasks, is easily distracted, frequently does not listen, commonly fails to finish schoolwork, has not been able to complete any of the class projects this year, and frequently loses school books and supplies. Teachers also say that he constantly fidgets, often leaves his seat without permission, has trouble being quiet, talks excessively, frequently interrupts his classmates when trying to answer questions, and has difficulty waiting in line. The mother states that she has also been noticing similar behaviors at home and that his symptoms have been affecting him negatively academically and socially. The patient has no significant past medical history. The patient is in the 90th percentile for height and weight and has been meeting all the developmental milestones. He is afebrile, and his vital signs are within normal limits. A physical examination is unremarkable. Which of the following medications is a first-line treatment for this patient’s most likely diagnosis?? 
  {'A': 'Atomoxetine', 'B': 'Methylphenidate', 'C': 'Clonidine', 'D': 'Guanfacine', 'E': 'Haloperidol'},