This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Child Psychiatry, Subject name: Psychiatry
[{'content': "Which one of the following is not a Pervasive Developmental Disorder \nSelect and explain. \nA. Autistic disorder, B. Conduct disorder, C. Asperger's disorder, D. Rett's disorder", 'role': 'user'}, {'content': "Answer: B \nExplanation: Pervasive Developmental Disorder- group of neurodevelopmental disorder. It includes- Autism (i.e. marked impairment in reciprocal social and interpersonal interaction) Asperger's syndrome is characterized by autism without any significant delay in language or cognitive development (including intelligence). Rett's syndrome is a disorder which is only repoed in girls so far. Heller's syndrome", 'role': 'assistant'}]