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
All are true about ADHD except 
Select and explain. 
A. Methyphenidate is the drug of choice for ADHD, B. Symptoms should be present in more than one setting, C. Symptoms should be present before 7 years for diagnosis, D. Symptoms should be present before 12 years for diagnosis
D: Symptoms should be present before 12 years for diagnosis
Answer: D: Symptoms should be present before 12 years for diagnosis 
Explanation: According to DSM - V for diagnosis of ADHD symptoms should be present before 12 years.