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
Drug of choice for attention deficit disorder with hyperactivity is: September 2009 
Select and explain. 
A. Chlorpromazine, B. Clonidine, C. Imipramine, D. Methylphenidate
D: Methylphenidate
Answer: D: Methylphenidate 
Explanation: Ans. D: Methylphenidate Attention-Deficit Hyperactivity Disorder/ ADHD/ AD/ HD is a neurobehavioral developmental disorder. It is primarily characterized by "the co-existence of attentional problems and hyperactivity, with each behavior occurring infrequently alone" and symptoms staing before seven years of age. ADHD is the most commonly studied and diagnosed psychiatric disorder in children, affecting about 3% to 5% of children globally. Stimulant medication are the most commonly prescribed medications for ADHD. The most common stimulant medications are the chain subsitituted amphetamine methylphenidate (currently, the drug of choice), dextroamphetamine and dexamohetamine. Atomoxetine, a norepinephrine reuptake inhibitor, may be an alternative for children who do not respond to stimulants.