<prompt> A 13 years old boy often argue with parent and teachers. However he is not physical aggressive and there is no history of drug abuse, theft, lying or bullying. Most likely diagnosis is-Conduct disorderOppositional defiant disorderAutismPervasive developmental disorder  <response>: Ans: B. Oppositional defiant disorderRef: Kaplan saddocks the p. 11391This boy is showing a pattern of defiance of authority arguing with parents and teachers.There are no features of conduct disorder drug abuse, theft lying.Thus, the diagnosis is oppositional defiant disorder. 