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: Psychiatry
[{'content': 'The following are characteristic of autism, EXCEPT: \nSelect and explain. \nA. Onset after 6 years of age, B. Repetitive behavior, C. Delayed language development, D. Severe deficit in social interaction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The onset of autistic disorder always occurs before age 3, at two peak periods. Autistic disorders are characterized by the triad of impaired social interaction, communication and imagination. These are associated with rigid repetitive pattern of behaviour. Ref: Essential Pediatrics By O P Ghai, 6th Edition, Page 65; Autism: A Very Sho Introduction By Uta Frith, 2008, Preview.', 'role': 'assistant'}]