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
Elevated mood for ______ is essential to diagnose as mania. 
Select and explain. 
A. 1 week, B. 2 week, C. 3 week, D. 4 week
A: 1 week
Answer: A: 1 week 
Explanation: Elevated mood for 1 week is the essential criteria to diagnose mania.