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: Dental
[{'content': 'A\tseverely\tincapacitating disturbance of\tmental and\nemotional development that causes problem in learning,\ncommunication, and relating to others is \nSelect and explain. \nA. Autism, B. Learning disability, C. Mental retardation, D. Dyslexia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]