This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sympathetic System, Subject name: Pharmacology
[{'content': 'Drug of choice for attention deficit hyperactivity disorder is:- \nSelect and explain. \nA. Haloperidol, B. Imipramine, C. Alprazolam, D. Methylphenidate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Methylphenidate is the preferred drug for the treatment of attention deficit hyperkinetic disorder (ADHD). Other drugs used for this indication are amphetamines, atomoxetine and pemoline. Pemoline has been withdrawn due to life threatening hepatotoxicity.', 'role': 'assistant'}]