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': 'A 3 year old child presents with normal development milestones except delayed speech and poor concentration. He has difficulty in communication and relating to others and also difficulty in making friends but plays with himself. The likely diagnosis is: \nSelect and explain. \nA. Autism, B. ADHD, C. Specific learning disability, D. Mental retardation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Autism', 'role': 'assistant'}]