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 3 year old boy with normal developmental milestones with delayed speech and difficulty in communication and concentration is not making friends. Most probable diagnosis is: \nSelect and explain. \nA. Autism, B. ADHD, C. Mental retardation, D. Specific learning disability', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Autism is a neurologic disorder characterized by, Qualitative impairments in social interaction Qualitative impairments in communication Restricted repetitive and stereotyped patterns of behavior, interests, and activities Ref: Goldson E., Reynolds A. (2012). Chapter 3. Child Development & Behavior. In W.W. Hay, Jr., M.J. Levin, R.R. Deterding, J.J. Ross, J.M. Sondheimer (Eds), CURRENT Diagnosis & Treatment: Pediatrics, 21e.', 'role': 'assistant'}]