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
Which of the following is also called as "minimal brain dysfunction syndrome"? 
Select and explain. 
A. Dyslexia, B. ADHD, C. Mental retardation, D. Down's syndrome
B: ADHD
Answer: B: ADHD 
Explanation: None