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
Which of the following is not a central characteristic of childhood autism? 
Select and explain. 
A. Impaired social interaction, B. Impaired communication, C. Restricted, repetitive behaviour, D. Callous and unemotional traits
D: Callous and unemotional traits
Answer: D: Callous and unemotional traits 
Explanation: 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