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': "All of the following are classified under Pervasive Developmental Disorders except? \nSelect and explain. \nA. Asperger Syndrome, B. Childhood Disintegrative Disorder, C. Down Syndrome, D. Heller's syndrome", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C. Down SyndromePervasive developmental disorder includes:* Autistic disorder* Asperger's disorder* Childhood disintegrative disorder,* Rett syndrome* Pervasive developmental disorder not otherwise specified.", 'role': 'assistant'}]