This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'A 6 year old child has history of birth asphyxia does not communicate well, has slow mental and physical growth, does not mix with people, has limited interest, gets widely agitated if disturbed, diagnosis is – \nSelect and explain. \nA. Hyperkinetic child, B. Autistic disorder, C. Attention deficity disorder, D. Schizophrenia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]