<prompt> The preferred drug for treating attention deficit hyperactivity disorder in a 6 year old boy, whose father has a history of substance abuse:-MethylphenidateAtomoxetineClonidineDexamphetamine  <response>: Attention deficit hyperactivity disorder - Boys girls Age : 5 to 12 years Clinical features Inattention Hyperactivity Impulsiveness - often has troubles waiting ones turn Rx Stimulants - Methylphenidate DOC Dexmethylphenidate Non stimulants - Atomoxetine- If history of substance abuse 