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': 'Which of the following is also called as "minimal brain dysfunction syndrome"? \nSelect and explain. \nA. Dyslexia, B. ADHD, C. Mental retardation, D. Down\'s syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]