<prompt> Which one of the following is not a Pervasive Developmental DisorderAutistic disorderConduct disorderAspergers disorderRetts disorder  <response>: Pervasive Developmental Disorder- group of neurodevelopmental disorder. It includes- Autism i.e. marked impairment in reciprocal social and interpersonal interaction Aspergers syndrome is characterized by autism without any significant delay in language or cognitive development including intelligence. Retts syndrome is a disorder which is only repoed in girls so far. Hellers syndrome 