This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'Which of the following is not a central characteristic of childhood autism? \nSelect and explain. \nA. Impaired social interaction, B. Impaired communication, C. Restricted, repetitive behaviour, D. Callous and unemotional traits', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Callous and unemotional traits (CU) are distinguished by a persistent pattern of behavior that reflects a disregard for others, and also a lack of empathy and generally deficient affect seen in conduct disorder and antisocial personality disorder. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]