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. He 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: Delayed speech, difficulty in communication and concentration in a 3 year old child suggests the diagnosis of autism.\nAutism\n\nAutism is a neurologic disroder characterized by -\n\n\nQualitative impairment in social interaction\nQualitative impairment in communication.\nRestricted repetitive and streotyped patterns of behaviour, interests, and activities.', 'role': 'assistant'}]