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
The preferred drug for treating ADHD in a 7 yr old boy, whose father has a history of substance abuse : 
Select and explain. 
A. Methylphenidate, B. Atomoxetine, C. Clonidine, D. Dexamphetamine
B: Atomoxetine
Answer: B: Atomoxetine 
Explanation: Methylphenidate is a stimulant used as DOC for ADHD, but stimulants are contraindicated in patient with family history of substance abuse. Therefore non stimulants are used and Atomoxetine is preferred over Clonidine.