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
Which of the following is associated with obsessive compulsive dissorder? 
Select and explain. 
A. Mania, B. Depression, C. Delusion, D. Schizophrenia
B: Depression
Answer: B: Depression 
Explanation: At least 1/2 of the people with OCD later develop sever depressive episode. They are considered as a seperate condition.