<prompt> A 13 year young boy is brought by his parents with history of frequent fighting at school, disciplinary problems, stealing money, assaulting his batch mates and being weak in studies. What is the most appropriate diagnosis for this child:Attention deficit hyperactivity disorderConduct disorderAutismNothing abnormal teenage phenomenon  <response>: Ans b Conduct disorderAhuja 5th173, Kaplan 9th1234-6The child is not normal and suffers from conduct disorder.Differentiation between different disorders mentioned in the questionAutismAttention Deficit DisorderConduct DisorderThere is marked impairment of reciprocal social and interpersonal interaction:Absence of social smile Absence of fear Lack of attachment to parents and absence of separation anxiety Lack of friendsMore common in males, the onset occurs before the age of 7 years, characterized, by: Poor attention span with distractibility Hyperactivity Impulsivity Moving about here and thereThere is violationof rights andrules like: Frequent lying Stealing or robbery. Running away from home school Physical violence Cruelty Poor at studies 