This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Psychiatry
[{'content': 'All of the following are essential features of Attention Deficit Hyperactivity Disease (ADHD) EXCEPT \nSelect and explain. \nA. Lack of concentration, B. Impulsivity, C. Mental retardation, D. Hyperactivity', 'role': 'user'}, {'content': "Answer: C \nExplanation: (C) Mental retardation # Attention deficit hyperactivity disorder (ADHD) is seen in 3% of school age children onset occurs before age of 7 years (mainly 4th year)> Types: with hyperactivity, without hyperactivity, residual type, conduct disorder.> Mental retardation should always be excluded before making a diagnosis of attention deficit hyperactivity disorder.> Symptoms: Poor attention span, hyperactivity, impulsivity.> Treatment: Dextroamphetamine and methylphenidate are the drugs of choice.> Attention deficit hyperactivity disorder is the most common neurobehavioral disorder of childhood. According to fourth edition of American Psychiatric Associations' diagnostic and statistical manual (DSM IV). ADHD is characterized by - Inattention Hyperactivity Impulsivity> Diagnostic criteria for Attention Deficit Hyperactivity Disorder (ADHD) have been elaborated.", 'role': 'assistant'}]