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
[{'content': 'The preferred drug for treating ADHD in a 7 yr old boy, whose father has a history of substance abuse : \nSelect and explain. \nA. Methylphenidate, B. Atomoxetine, C. Clonidine, D. Dexamphetamine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Methylphenidate is a stimulant\xa0used 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\xa0over Clonidine.', 'role': 'assistant'}]