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
An 8 year old student complains of lack of interest in studies for the last 6 months. He has frequent quarrels with his parents and has frequent headaches. The most appropriate clinical approach would be : 
Select and explain. 
A. Leave his as normal adolescent problem, B. Rule out depression, C. Rule out migraine, D. Rule out an oppositional defiant disorder
B: Rule out depression
Answer: B: Rule out depression 
Explanation: Frequent quarrels with parents (quick temper / easily angered) can be seen both in :


Depression in children.
Oppositional defiant disorder.


However, Physical symptoms (e.g., headache) and lack of interest occur in depression in children (not in oppositional defiant disorder).