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: Pharmacology
Drug of choice for attention deficit hyperactivity disorder is: 
Select and explain. 
A. Fluoxetine, B. Haloperidol, C. Deriphyllin, D. Methylphenidate
D: Methylphenidate
Answer: D: Methylphenidate 
Explanation: None