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': 'Which of the following is associated with obsessive compulsive dissorder? \nSelect and explain. \nA. Mania, B. Depression, C. Delusion, D. Schizophrenia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: At least 1/2 of the people with OCD later develop sever depressive episode. They are considered as a seperate condition.', 'role': 'assistant'}]